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Home / Erectile Dysfunction / Viagra / First-Time Viagra Guide: Expert Tips for Safe and Effective Use

First-Time Viagra Guide: Expert Tips for Safe and Effective Use

It can be tricky to know what to expect your first time taking Viagra. You’ve heard the hype, but how do you make it work for you? If you’re using Viagra for the first time and you’re feeling unsure, don’t worry, we’ve got you covered.

From when to take it to how often it’s safe to use, here are our top tips for first-time Viagra users to help you get the best results from your erectile dysfunction treatment.

Guide for First-Time Viagra Users

Key takeaways

  • Viagra is the most widely used treatment for erectile dysfunction worldwide.
  • Take Viagra 30-60 minutes before you plan to have sex.
  • Viagra works by relaxing your blood vessels and increasing blood flow to the penis.
  • You should feel the effects only when you are sexually aroused.
  • Side effects can include headache, feeling sick, hot flushes, and indigestion.
  • 50 mg is the usual recommended starting dose.
  • 25 mg tablets may be prescribed if you have an underlying health condition, or 100 mg if 50 mg doesn’t work.

How does Viagra work?

Viagra works by increasing blood flow to the penis. The active ingredient, sildenafil, relaxes your blood vessels, allowing for stronger, more reliable erections in men with erectile dysfunction (ED).

Contrary to popular belief, Viagra only works when you are sexually stimulated, meaning you shouldn’t get random erections. Simply take your tablet 30 minutes to an hour before you plan to have sex, and you should find it far easier to get and maintain an erection.

Is Viagra safe?

In order to be approved for use, Viagra underwent rigorous clinical trials to ensure safety and effectiveness as an erectile dysfunction medication.

A review of such trials found that Viagra users experienced no more significant side effects than those taking a placebo. However, you still need a prescription for Viagra to ensure the treatment is safe and suitable for you.

What to expect the first time using Viagra

To get the most out of Viagra, it’s important to know what to expect the first time.

Viagra quick facts
Onset time 30-60 minutes
Dosage range 25-100 mg
Duration 4-6 hours

Here’s a timeline of what should happen your first time taking Viagra:

Viagra timeline guide

Understanding the medication’s effects over time

You take your tablet

Starting point

Take one tablet at your prescribed strength 30-60 minutes before you plan to have sex.

You begin to feel the effects

30-60 minutes after ingestion

For most people, Viagra takes around 30-60 minutes to take effect, however, it has been known to work in as little as 12 minutes.

Peak effects are felt

1-2 hours after ingestion

Viagra usually reaches its peak effect 1-2 hours after taking it. This is when it's most effective during sex.

Effects begin to wear off

Up to 4 hours after ingestion

Viagra usually lasts for up to 4 hours, although the effects become weaker nearer the end.

Viagra leaves your system

24 hours after ingestion

After 4-5 hours the effects will wear off completely, but Viagra can stay in your system for up to 24 hours.

Medical disclaimer

This information is for educational purposes only and should not replace professional medical advice. Always consult with your healthcare provider before starting any medication.

How much Viagra should I take the first time?

Viagra comes in three different strengths to suit individual needs and health conditions. Your doctor will prescribe the right dose based on factors like your overall health, other medications you take, and how your body responds. Below is a simple guide to when the 25 mg, 50 mg, or 100 mg doses might be recommended.

Lowest Dose

25 mg

This is the lowest dose of Viagra available and is usually prescribed when 50 mg is considered unsafe. Consider this dose if you are over 65 years old or have heart or liver problems.

Standard Starting Dose

50 mg

This is the usual starting dose of Viagra and the standard dose for most users. This dose balances effectiveness with a lower risk of side effects.

Maximum Dose

100 mg

100 mg is the highest dose of Viagra available. It's prescribed to men under 65 years old with no relevant underlying health issues, and only when lower doses haven't been effective.

Important note:

Never take more than 1 tablet per day, no matter the dose.

How to prepare for your first time taking Viagra

Preparation is the key to getting the best results when taking Viagra. To make the most of your experience, follow our quick guide below on how to prepare for your first time using ED medication.

Medical checklist

Before taking Viagra for the first time, it’s important to review your health and current medications to ensure treatment is safe and effective.

Here are some important things to consider:

  • Avoid with certain medications — Do not take Viagra if you are using nitrates (often prescribed for chest pain) or certain blood pressure medicines, as this can cause a dangerous drop in blood pressure.
  • Health conditions — Inform your doctor if you have heart disease, a recent stroke, liver or kidney problems, or any eye conditions, as Viagra may not be suitable.
  • Allergies and reactions — If you have experienced allergic reactions to ED medications before, discuss alternatives with your healthcare provider.

Meal planning

What you eat can affect how fast Viagra works and how effective it is.

Keep these tips in mind:

  • Avoid fatty foods — High-fat meals can delay absorption and reduce Viagra’s impact.
  • Take on an empty stomach — When taken without food, Viagra is absorbed quickly and it should start working sooner.
  • Limit alcohol — Drinking too much alcohol can reduce Viagra’s effectiveness and worsen side effects like nausea and dizziness.

Foods rich in nitrates may improve erections by boosting nitric oxide, which causes your blood vessels to widen. Consider including more beetroot and spinach in your diet to naturally support erectile function.

Silvia Fonda Nutritionist

Creating the right environment

No matter how effective Viagra is, there’s no point taking it if you’re not in the mood. That’s why it’s important to create an atmosphere ideal for intimacy when taking Viagra, especially if it’s your first time.

Follow these tips to create the perfect environment for sexual activity:

  • Choose a relaxing, private setting where you feel at ease.
  • Light candles, play soft music, or do whatever helps you feel calm.
  • Set aside some time so you can focus on having a fun, satisfying experience.

What are the side effects of Viagra?

Viagra is generally well-tolerated, but it can produce side effects in some people. These are mild for the most part and should go away after some time, but some may be more serious.

Viagra’s side effects include:
  • Nausea
  • Facial flushing
  • Hot flush
  • Indigestion
  • Changes in vision
  • Stuffy nose
  • Dizziness

If you experience side effects on 50 mg or 100 mg of Viagra, consider asking your doctor to lower your dose to 25 mg. This reduces the risk of experiencing side effects.

To manage common Viagra side effects like headaches or flushing, stay well-hydrated, avoid alcohol, and consider taking it on an empty stomach. If side effects persist or worsen, stop taking Viagra and consult your doctor.

Dr. Caroline Fontana Lead Prescribing Doctor

Tips to maximise your chance of success with Viagra

Success using Viagra isn’t just down to physical factors, your mindset also plays an important role. Take note of the following to give yourself the best chance at success when taking Viagra:

Image 1

Communicate openly

  • Be honest and let your partner know you’re using Viagra. They can help you feel at ease.
  • Keep things light, reassuring, and playful.
  • Express your needs to your partner and listen to theirs. A pleasant experience starts with open communication.
Image 2

Limit distractions

  • Turn off your phone or anything else that could interrupt the moment.
  • Stay present and commit yourself completely to the moment.
  • Take a few deep breaths and clear your mind before you begin.
Image 3

Take note of your headspace

  • Don’t force the moment. Take Viagra when you’re ready and relaxed, not when you’re stressed.
  • Don’t rush things. Some light foreplay or cuddling beforehand can ease you into the process.
  • Manage your expectations. Viagra makes things easier, but you still need to put in the effort to make the most of your experience.

Anxiety about performance can counteract Viagra’s effects. I tell my patients that the first dose is about learning how your body responds to treatment. Try to remove the pressure and focus on connection with your partner.

Dr. Caroline Fontana Lead Prescribing Doctor

What alternatives to Viagra are available?

If Viagra doesn’t work for you, there are alternative treatments that might. Like Viagra, these are all PDE-5 Inhibitors, meaning they work in the same way to treat erectile dysfunction. However, they contain different active ingredients, which can affect how quickly they work, how long they last, and how well they're tolerated.

Viagra Cialis Levitra Spedra
Generic ingredient Sildenafil Tadalafil Vardenafil Avanafil
Prescription required? Yes, but an over-the-counter version is also available (Viagra Connect) Yes Yes Yes
How fast does it work? Within 30-60 minutes Within 30 minutes Within 30-60 minutes Within 15-30 minutes
How long does it last? Around 4 hours Up to 36 hours Up to 5 hours Up to 6 hours

Long-term expectations and follow-up care

If Viagra works well for you the first time, that’s a great sign, but it’s only the beginning. If you wish to use Viagra long term, it’s important to take note of how it affects you going forward and check in with your doctor regularly.

If you take the proper precautions and use Viagra safely, it can become a long-term treatment that helps you maintain a satisfying and healthy sex life.

Can you buy Viagra over the counter?

No*, most forms of Viagra are not available over the counter in the UK. They require a prescription from a doctor or pharmacist. At euroClinix, we prescribe Viagra for men over 18 with erectile dysfunction.

A prescription is important because it helps ensure the treatment is:

  • Safe for your heart and overall health
  • The right dose for your individual needs
  • Not affected by other medications you're taking
  • Part of a proper assessment for underlying causes of erectile dysfunction

*Viagra Connect (50mg), however, is an over-the-counter version of Viagra. It doesn’t need a prescription, but you’ll still need a short consultation with a pharmacist to check it’s suitable for you.

Fast, effective treatment

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Frequently asked questions

Will Viagra make me last longer in bed?
What happens if I accidentally take two Viagra tablets in one day?
Does Viagra usually work the first time?
Can I cut a Viagra tablet in half?
Will Viagra cause unexpected erections?
Can I take Viagra if I've had a few drinks at dinner?
What if my erection doesn’t go away?
Can I exercise after taking Viagra?
How long after eating a meal should I wait before taking Viagra?
Does Viagra help with premature ejaculation?
Does Viagra work every time?
Medically reviewed by Dr. Caroline Fontana Written by our editorial team Last reviewed 19-08-2025

Further reading

Alternatives to Viagra

Alternatives to Viagra

Reviewed by Dr. Caroline Fontana
Viagra Dosage Guide: Finding Your Dose

Viagra Dosage Guide: Finding Your Dose

Reviewed by Dr. Caroline Fontana
Can you buy Viagra online without a prescription?

Can you buy Viagra online without a prescription?

Reviewed by Dr. Caroline Fontana
10 Effective Foods to Help with Erectile Dysfunction

10 Effective Foods to Help with Erectile Dysfunction

Reviewed by Dr. Caroline Fontana
Viagra and how it reacts with other medicines

Viagra and how it reacts with other medicines

Reviewed by Dr. Caroline Fontana
Viagra: the side effects explained

Viagra: the side effects explained

Reviewed by Dr. Caroline Fontana
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