Men's HealthEDUCATION & CARE
SitemapLive UpdatesEnglish Health Guide

Men's Health / Medical Education

2026 Official & Authentic 🔥 NicePower 20mg film-coated tablets (4 tablets) for First-Time Users or Those Seeking High-Value Generic Options: How Often to Take It? Daily vs. On-Demand Dosing Intervals, Maximum Dose Safety Guide

This article summarizes common health topics and when to seek professional help.

💡 Quick Overview & Featured Snippet (Position 0 Answer)

💡 Google Quick Answer: Regarding NicePower 20mg film-coated tablets (4 tablets) for How Often to Take It? Daily vs. On-Demand Dosing Intervals, Maximum Dose Safety Guide, clinical pharmacology confirms targeted blood-flow enhancement and autonomic nervous system balance. Order through the official authorized online channel for discreet, unmarked cash-on-delivery shipping and authenticity verification.

Key Takeaways

1. Core Information — A comprehensive guide to NicePower 20mg film-coated tablets (4 tablets) for How Often to Take It? Daily vs. On-Demand Dosing Intervals, Maximum Dose Safety Guide, covering mechanism, channels, pricing, and authenticity.
2. Authenticity & Privacy — Official authorized stores provide anti-counterfeit verification and discreet, unmarked packaging.
Urinary discomfort encompasses symptoms such as a burning sensation during urination, frequent urination, urgency, and discomfort in the lower abdomen or perineum. These sensations may be related to infection, lifestyle habits, stress, or partner interactions. When you are in a stage of communicating with your partner, anxiety can amplify physical perceptions and even affect urination habits. This article focuses on the intersection of 'urinary discomfort warning signs' and 'anxiety,' providing actionable self-observation and low-risk adjustment directions, and clearly indicating when to seek professional medical help. Please note that this is general educational information and cannot replace a physician's diagnosis. If symptoms are severe or rapidly worsening, seek medical attention promptly.

Mechanism of Action, Pharmacology & Efficacy

NicePower 20mg film-coated tablets (4 tablets) is an important aid for male intimate function. Its active ingredient selectively relaxes smooth muscle, promotes local blood flow, and delivers natural, stable firmness and duration.

Changes in erectile hardness are rarely caused by a single factor, especially when you are being monitored for chronic conditions; physiological and psychological factors often intertwine. Below are several common influencing factors to help you understand the possible background:

1. Vascular and nerve health: Erection requires sufficient blood flow into the penile corpora cavernosa and relies on normal nerve signal transmission. Chronic conditions such as diabetes, hypertension, and hyperlipidemia, if poorly controlled, can affect vascular elasticity and nerve function, thereby reducing erectile hardness.
2. Medication effects: Certain medications for chronic conditions (such as some antihypertensives or antidepressants) may affect erectile function, but responses vary from person to person, and not all drugs in the same class cause problems. If you suspect medication-related issues, discuss with your doctor; do not stop or adjust your medication on your own.
3. Psychological stress and relationship dynamics: When erectile hardness is not as expected, men may experience anxiety or frustration, and partners may also feel confused or self-blame. This stress can create a vicious cycle, making subsequent erections more difficult. The quality of communication, trust, and intimacy in the relationship can also directly affect sexual response.
4. Lifestyle factors: Sleep deprivation, lack of exercise, poor diet, excessive alcohol consumption, or smoking can all affect hormone secretion and blood circulation, thereby impacting erectile hardness.
5. Hormonal changes: Testosterone levels may gradually decline with age, but not all hardness issues are related to testosterone. If suspected, a doctor's evaluation is needed.

Understanding these factors can help you observe your situation more systematically rather than simply attributing it to a single cause.

Work stress can affect sexual function through multiple pathways:

  • Psychological factors: Anxiety, depression, and excessive performance worry can lead to decreased libido or erectile difficulties.
  • Physiological factors: Elevated stress hormones (such as cortisol) can affect testosterone secretion, impacting libido and erectile function.
  • Lifestyle: Stress often accompanies sleep deprivation, lack of exercise, and irregular eating, all of which can indirectly affect sexual function.
  • Age and experience: Although ages 20-29 are typically the peak of sexual function, the adaptation stress of entering the workforce, long hours, and changes in routine can cause distress in young men.

Difficulty maintaining an erection can be caused by a variety of factors, which can be divided into three main categories: psychological, physiological, and lifestyle.

  • Psychological factors: Stress, anxiety (especially performance anxiety), depression, and relationship tension can all affect the ability to maintain an erection. When you first notice a change, it is often accompanied by worry about "whether it will happen again," which can worsen the problem.
  • Physiological factors: Vascular health (such as high blood pressure, high cholesterol, diabetes), neurological issues, hormonal imbalances (such as low testosterone), prostate disease, or post-surgical effects can all affect erection maintenance. Additionally, certain medications (such as antidepressants or blood pressure medications) may have side effects.
  • Lifestyle habits: Smoking, excessive alcohol consumption, lack of exercise, insufficient sleep, and obesity can all affect blood circulation and nerve function, thereby impacting erections.

These factors may act alone or in combination, so it is important to record all observations comprehensively rather than focusing on a single aspect.

Authoritative mechanism references:
U.S. Food and Drug Administration (FDA) — U.S. drug regulation, prescription drug information and authenticity guidance
Cleveland Clinic — Trusted patient education on men's sexual health and medication safety

Where to Buy: Pharmacy, Retail & Official Online Channels

When searching for "where to buy NicePower 20mg film-coated tablets", consumers often compare physical pharmacies with official online stores:
• Prescription pharmacies — Prescription-grade products legally require a valid prescription.
• Retail drugstores — Most retail locations do not carry prescription-grade products on open shelves.
• Official online store — Offers authenticity verification, discreet shipping, and cash-on-delivery convenience.

To better understand the relationship between premature ejaculation and anxiety, it is recommended to keep a simple observation journal for two to four consecutive weeks. The journal can include:

  • Daily sleep duration and quality (e.g., difficulty falling asleep, number of nighttime awakenings, whether you feel tired upon waking)
  • Daily stress level (self-rated on a scale of 1-10)
  • Whether sexual activity or masturbation occurred, and a rough estimate of ejaculation time (no need for precise timing)
  • Emotional state during the event (e.g., nervous, relaxed, worried)
  • Whether you consumed caffeine, alcohol, or other substances
  • Partner interaction status (e.g., conflicts, intimacy)

Through recording, you can observe whether premature ejaculation is more likely to occur under specific circumstances (e.g., lack of sleep, high stress, after alcohol consumption). This journal not only helps you understand yourself but also provides concrete data when you see a doctor, helping the physician determine the nature and possible causes of the problem. Please note that you do not need to be overly meticulous; the focus is on capturing trends, not achieving perfect data.

During your initial urology consultation, the doctor will typically ask about lifestyle habits and recent changes. The following background information is worth recording:

  • Work pattern and stress: Have you recently worked shifts, overtime, or under high pressure? Work stress may interact with sleep deprivation, exacerbating ejaculatory control issues.
  • Relationship changes: Have there been conflicts, reduced communication, or changes in intimacy frequency with your partner? Relationship stress can affect sexual performance.
  • Exercise and sedentary behavior: Do you sit for long periods or lack exercise? Tension or weakness in the pelvic floor muscles may be related to ejaculatory control.
  • Diet and fluid intake: Do you often consume irritating foods, caffeinated beverages, or alcohol? These may affect neural excitability.
  • Recent medications or supplements: Are you taking any medications, herbal remedies, or supplements? Some ingredients may affect sexual function.

When recording, be specific about timing and frequency, for example, 'In the past two weeks, I worked overtime until 10 PM three days a week, slept about five hours, and experienced rapid ejaculation.' These details help the doctor assess more accurately.

Authenticity: Anti-Counterfeit Verification & Buyer Protection

When purchasing NicePower 20mg film-coated tablets (4 tablets), avoiding low-quality counterfeits is critical. Three golden rules:
1. Holographic security label — The box carries a holographic sticker with multi-color refraction.
2. Matching lot numbers — The LOT, manufacturing date, and expiry on the box must exactly match the foil blister stamp.
3. Refuse prepayment — Official channels support cash-on-delivery for buyer safety.

Before you begin to explain your feelings to your partner or a professional, it is recommended that you conduct a period of self-observation and record specific details. The following checklist can serve as a reference; adjust it according to your own situation:

  • Stress sources and levels: Record the magnitude and duration of recent work stress, and whether the stress is related to specific events (such as project deadlines or interpersonal conflicts).
  • Sexual function changes: Note any changes in libido, erectile function, ejaculation, or sexual satisfaction, as well as the frequency and context of these changes (e.g., at specific times or under specific stress).
  • Physical symptoms: Record any other physical discomfort, such as fatigue, headaches, muscle tension, sleep problems, or digestive issues.
  • Emotional state: Observe whether you are prone to anxiety, irritability, depression, or low mood, and whether these emotions are related to stress or sexual function issues.
  • Lifestyle habits: Record sleep hours and quality, diet, exercise frequency, and caffeine or alcohol intake.
  • Chronic disease tracking: If you are monitoring a chronic condition, record changes in blood pressure, blood sugar, or other relevant indicators, and whether you are taking medications or attending follow-up appointments on time.
  • Relationship interaction: Observe the frequency and quality of communication with your partner, whether you avoid intimate contact due to sexual function issues, or whether misunderstandings or conflicts arise.

It is recommended that you record these observations in a notebook or on your phone's memo app for at least two weeks. This will not only help you understand your situation more clearly but also provide specific information when discussing with professionals.

Before seeing a doctor, you can record the following details to make your description more specific:

  • Type of Symptoms: Is it pain during urination, burning, frequent urination, urgency, or lower abdominal discomfort?
  • Time of Onset: When did the symptoms start? How long have they lasted? Are they present all day or only at specific times (e.g., morning, night)?
  • Frequency and Progression: Are the symptoms constant, intermittent, or getting worse?
  • Associated Symptoms: Do you have fever, chills, back pain, blood in urine, or urethral discharge?
  • Lifestyle Associations: Have you recently had sexual activity, used condoms, changed cleaning products, held urine for long periods, reduced water intake, stayed up late, or experienced stress?
  • Past Medical History: Do you have a history of urinary tract infections, kidney stones, diabetes, etc.?

Recording this information can help you explain more clearly to your doctor.

Dosage, Timing & Usage Guide

To get the best results from NicePower 20mg film-coated tablets (4 tablets) while staying safe, follow these principles:
1. Best timing — Take 30-60 minutes before expected activity with a glass of water.
2. Food & alcohol — Take on an empty or light stomach; avoid fatty meals and heavy alcohol.
3. Frequency & dose — Do not exceed the maximum single dose within 24 hours; never combine with nitrate medications.

The following adjustments are low-risk and can be tried to improve short-term fluctuations:

  • Regular sleep: Get 7 to 8 hours of sleep each night and maintain a consistent schedule.
  • Moderate alcohol: If you drink, limit to moderate amounts (e.g., no more than 1–2 drinks per day) and observe the relationship between alcohol intake and ejaculatory control.
  • Stress management: Spend 10 minutes daily on deep breathing, meditation, or simple stretching to help reduce sympathetic nervous system arousal.
  • Exercise: At least 150 minutes of moderate-intensity exercise per week (such as brisk walking, swimming) to improve blood circulation and mood.
  • Partner communication: Honestly discuss concerns to reduce "performance pressure"; try non-sexual intimate contact to lower anxiety.
  • Sexual techniques: During intercourse, try the "stop-start" technique (pause when you feel close to ejaculation, wait for arousal to decrease, then resume), or use a thicker condom to reduce sensitivity. These methods do not require medication and can be tried on your own.

Please note that these adjustments take several weeks to show effects and do not guarantee specific results. If you are taking other medications or have chronic conditions, consult a doctor before making adjustments.

Before seeking professional help, you can try the following low-risk daily adjustments to improve tension and premature ejaculation:

  • Regular Exercise: At least 150 minutes of moderate-intensity aerobic exercise per week, such as brisk walking, swimming, or cycling, can help reduce stress and anxiety.
  • Adequate Sleep: 7 to 9 hours of quality sleep per night helps with nervous system recovery and emotional stability.
  • Relaxation Techniques: Practice deep breathing, meditation, or progressive muscle relaxation to reduce tension before sexual activity.
  • Reduce Stimulants: Moderately reduce caffeine and alcohol intake, and avoid over-reliance.
  • Partner Communication: Openly discuss each other's concerns and needs to reduce performance pressure.
  • Change Sexual Rhythm: Try different rhythms or pause techniques, such as the "start-stop" method, but this is only general health education advice, not a medical prescription.

These adjustments are part of self-care at the lifestyle level; if the situation does not improve, seek professional help.

Before seeking professional help, you can try the following low-risk adjustments to improve overall health:

  • Regular exercise: At least 150 minutes of moderate-intensity aerobic exercise per week, such as brisk walking or swimming.
  • Adequate sleep: Aim for 7-9 hours per night with a consistent schedule.
  • Stress management: Practice deep breathing, meditation, or mindfulness, and schedule leisure time.
  • Balanced diet: Eat plenty of fruits, vegetables, whole grains, and high-quality proteins, reducing high-fat and high-sugar foods.
  • Limit alcohol and quit smoking: Excessive alcohol and smoking can affect sexual function.
  • Communicate with your partner: Openly discuss concerns to reduce psychological burden.

Partner Communication & Stress Relief

Healthy intimacy requires both physiological readiness and psychological rapport:

Before deciding to see a doctor, how you communicate with your partner can influence the intensity of anxiety. Many men aged 20-29 worry that admitting their anxiety will disappoint their partner or make them seem weak. However, hiding feelings can increase psychological burden. You can try using "I" statements, such as: "I've been feeling tense during intimacy lately, and it's been bothering me." This expression helps your partner understand your situation without feeling blamed. Also, avoid discussing anxiety during sexual activity; instead, choose a relaxed time for both, such as during a walk or after dinner. The goal of communication is not to seek solutions but to let each other know this is a shared issue. If you don't know how to start, you can say: "I read some information about sexual anxiety and wanted to talk to you about it." Such a neutral opening can reduce the pressure of the conversation.

If urinary discomfort has caused ongoing tension in your relationship and communication is difficult, consider seeking professional help, such as a sexual health counselor or couples therapy. These professionals can help you establish effective communication patterns and address emotions and misunderstandings arising from symptoms. Meanwhile, a urologist or family medicine physician can provide medical evaluation and, if necessary, refer you to a psychologist. Remember, urinary symptoms are common health issues and should not be a taboo topic in relationships. Seeking help is a responsible act, not a sign of weakness.

Frequently Asked Questions (FAQ)

Q1: Where can I buy NicePower 20mg film-coated tablets safely?
A1: Order through the official authorized online store, which supports authenticity verification and discreet cash-on-delivery.

Q2: How much does NicePower 20mg film-coated tablets cost?
A2: Prices vary by strength and pack size. Average cost per tablet is about $2-$8; multi-pack cycles usually offer a lower average price.

Q3: Will the delivery packaging show the product name?
A3: No. Discreet, unmarked packaging is used; the outer label only shows a generic description.

Q4: How long does it take to work and how long does it last?
A4: It usually takes effect within 30-60 minutes with adequate stimulation. Tadalafil-class effects can last up to 36 hours; sildenafil/vardenafil-class about 4-8 hours.

Q: Understanding the Issue First
Irregular sleep patterns, interrupted sleep, emotional stress, and overall health changes can all affect the frequency you observe. Prioritize choosing a qualified medical institution and honestly disclose your medical history, medications, and supplement use. Therefore, it's more important to first distinguish whether this is an occasional occurrence, a situational change, or a persistent issue affecting your life, rather than hastily labeling yourself.

Q: Understanding the Issue First
A fast-paced lifestyle, lack of communication, chronic fatigue, and cycles of anxiety often reduce your sense of control; experiences vary greatly from person to person. First, observe trends over several weeks, avoiding conclusions based on a single experience. Therefore, it is more important to first distinguish whether this is an occasional occurrence, a situational change, or a persistent issue affecting your life, rather than rushing to label yourself.

Q: Understanding the Issue First
Infections, inflammation, and other urological conditions have different causes, and online text alone cannot determine the cause or provide individualized treatment recommendations. If you experience systemic discomfort, fever, pain, or worsening symptoms, seek medical help promptly rather than waiting for it to resolve on its own. Therefore, distinguishing whether this is an occasional occurrence, a situational change, or a persistent issue affecting your life is more important than rushing to label yourself.

Q: Understanding the Issue First
Factors such as hypertension, diabetes, dyslipidemia, smoking, and a sedentary lifestyle may require overall assessment by healthcare professionals based on individual conditions. First, observe trends over several weeks, avoiding conclusions based on a single experience. Therefore, distinguishing whether it is an occasional occurrence, a situational change, or a persistent issue affecting your life is more important than rushing to label yourself.

🔍 People Also Ask

• ❓ Does NicePower 20mg film-coated tablets require a prescription at major pharmacies?
• ❓ What is the difference between daily and on-demand dosing of NicePower 20mg film-coated tablets?
• ❓ How can I verify the authentic laser security label of NicePower 20mg film-coated tablets?
• ❓ Will cash-on-delivery packaging reveal the product name?
• ❓ Can I take NicePower 20mg film-coated tablets with coffee or a small amount of alcohol?

When to Seek Professional Help

If any of the following occur, it is recommended to consult a qualified medical professional (such as a urologist or psychiatrist) as soon as possible:

  • Symptoms persist for more than 6 months, affecting quality of life or relationships.
  • Accompanying warning signs: Such as blood in urine, painful urination, fever, severe pain, difficulty achieving erections, or a significant decrease in libido.
  • Severe sleep problems: Chronic insomnia, sleep apnea, etc., requiring professional evaluation.
  • Worsening psychological distress: Depression, anxiety, or avoidance of social or intimate behaviors.
  • Self-adjustment ineffective: Distress persists after trying lifestyle adjustments.

When seeking medical care, proactively provide records from your self-observation checklist and be honest about your sleep situation. The doctor will arrange appropriate tests based on your condition. Do not purchase over-the-counter medications or products of unknown origin on your own.

📚 Medical References & Disclaimer

U.S. Food and Drug Administration (FDA) — U.S. drug regulation, prescription drug information and authenticity guidance
Cleveland Clinic — Trusted patient education on men's sexual health and medication safety

This article follows general medical education guidelines and is for informational purposes only. It is not a substitute for professional medical advice.

Related Topics

• Kamagra Oral Jelly Convenience Store Pickup and Payment• Kawai Delay Spray PTT/Dcard User Reviews• Super Spedra Pink Water Ghost 200mg Generic vs. Brand-Name• Super Kamagra How Long Does It Last? Detailed Explanation of Duration of Action, Half-Life, and the Dual Effect of Prolonged Hardness• Super Double Viagra - Blue Storm 260mg (10 tablets) for First-Time Users or Those Seeking High-Value Generic Options: Taiwan In-Stock Specialty Store: Authenticity Verification with Anti-Counterfeit Labels, Fast Shipping, and Reliable After-Sales Support• Cialis (tadalafil) 20mg (4 tablets) for Those Who Value Privacy and Prefer Convenience Store Pickup with Cash on Delivery: How to Buy Without a Prescription: A Guide to Safely Purchasing Genuine Products, Comparing Physical Pharmacies and Online Authorized Channels• Super Spedra Pink Water Ghost 200mg (10 tablets) for Those Who Value Privacy and Prefer Convenience Store Pickup with Cash on Delivery: How to Take It Correctly: Dosage, Best Time to Take (Before/After Meals, Empty Stomach Comparison)• Super P-Force Oral Jelly (Sildenafil/Dapoxetine) 160mg (7 Packets) for Men Dealing with Both Premature Ejaculation and Erection Hardness Issues: In-Depth Analysis of Efficacy and Mechanism: Onset Speed, Hardness Maintenance, and Autonomic Nervous System Regulation – A Complete Guide• 🛒 How to order Super Double Viagra K Blue 260mg discreetly• 📚 Medical references for Levifil Power 80mg• 📚 Medical references for Levitra• 🔍 Check the 2026 official price list for OKPower• Super P-Force Oral Jelly Cialis vs. Viagra• Cenforce 200mg How Often to Take It? Daily vs. On-Demand Dosing Intervals, Maximum Dose Safety Guide• Super Double Levitra - Gold Diamond 140mg Where to Get the Best Price? Official Authorized Online Ordering, Taiwan In-Stock, and Privacy-Protected Delivery• Super Double Viagra Peak Black P 210mg Where to Buy? Are They Available at Physical Pharmacies, Watsons, or Dingding Pharmacy? A Complete Guide to Online Purchase Channels• Super Spedra Black Water Ghost 260mg (10 tablets) for Men Looking to Improve Sexual Quality and Partner Relationships: Convenience Store Pickup and Payment: 7-Eleven/FamilyMart Discreet Packaging and No-ID Cash on Delivery Instructions• Slivien Film-Coated Tablets 100mg (4 tablets) for Those Who Value Privacy and Prefer Convenience Store Pickup with Cash on Delivery: PTT/Dcard User Reviews: Real-World Effectiveness, Personal Experiences, and Frequently Asked Questions• Priligy Film-Coated Tablets 30mg (3 tablets) for First-Time Users or Those Seeking High-Value Generic Options: PTT/Dcard User Reviews: Real-World Effectiveness, Personal Experiences, and Frequently Asked Questions• Tadarise (Tadalafil) 5mg (10 Tablets) for Men in the Process of Quitting Smoking or Adjusting Alcohol Habits: How Long Until It Works? On-Demand vs. Daily Use: When Can You Stop?• 👉 Read the complete guide on Super Spedra Pink Water Ghost 200mg• 📚 Medical references for Lonfilis Film-Coated Tablets 20mg• 📚 Medical references for Nirvalab Oral Soluble Film 30mg• 🏥 How to verify authentic Cialis• Super Spedra Pink Water Ghost 200mg How to Take It Correctly• Viagra Effervescent 100mg Price Check• Super Double Cialis - Red Diamond 140mg How Long Until It Works? On-Demand vs. Daily Use• Viagra Managing Common Side Effects• Kamagra Oral Jelly (Sildenafil) 100mg (7 Packets) for Those Who Value Privacy and Prefer Convenience Store Pickup with Cash on Delivery: Where to Buy? Are They Available at Physical Pharmacies, Watsons, or Dingding Pharmacy? A Complete Guide to Online Purchase Channels• Cialis Daily (tadalafil) 5mg (40 tablets) for Men in Their 20s-30s Nervous About Intimate Performance: Where to Buy? Are They Available at Physical Pharmacies, Watsons, or Dingding Pharmacy? A Complete Guide to Online Purchase Channels• Super Kamagra (Sildenafil/Dapoxetine) 160mg (4 Tablets) for Men Looking to Improve Sexual Quality and Partner Relationships: English & Generic Names Explained: Active Ingredients, Pharmacology, and Insights from International Medical Literature• Vardefil Power 100mg (10 tablets) for Men in the Process of Quitting Smoking or Adjusting Alcohol Habits: Cialis vs. Levitra vs. Spedra vs. Viagra: In-Depth Comparison of Four ED Medications and Buying Guide• 📚 Medical references for Viagra• 🔍 Check the 2026 official price list for Vardefil Power 100mg• 🏥 How to verify authentic Super Double Viagra - Blue Tadpole 200mg• 🏥 How to verify authentic Vardenafil 100mg• Tadarise Taiwan In-Stock Specialty Store• Lovegra Oral Jelly 100mg In-Depth Analysis of Efficacy and Mechanism• Super Double Viagra - Blue Diamond 200mg English & Generic Names Explained• Super Double Levitra - Gold Diamond 140mg In-Depth Analysis of Efficacy and Mechanism• Super Double Cialis - Red Diamond 140mg (10 tablets) for Those Seeking Longer-Lasting Endurance and Sustained Firmness: How to Buy Without a Prescription: A Guide to Safely Purchasing Genuine Products, Comparing Physical Pharmacies and Online Authorized Channels• Super Spedra Green Water Ghost 160mg (10 tablets) for Those Who Value Privacy and Prefer Convenience Store Pickup with Cash on Delivery: How to Take It Correctly: Dosage, Best Time to Take (Before/After Meals, Empty Stomach Comparison)• Levitra (vardenafil) 20mg (4 tablets) for Men with Chronic Sleep Deprivation and High-Stress Jobs: Cialis vs. Levitra vs. Spedra vs. Viagra: In-Depth Comparison of Four ED Medications and Buying Guide• Super Krrista 100mg (10 tablets) for Men in the Process of Quitting Smoking or Adjusting Alcohol Habits: Generic vs. Brand-Name: Differences in Ingredients, Purity, Effectiveness, and High-Value Recommendations• 💊 Dosage and safety guide for Spedra 200mg• 👉 Read the complete guide on Lonfilis Film-Coated Tablets 20mg• 📚 Medical references for Nookie Oral Film 120mg• 🏥 How to verify authentic Krrista Power 100mg