Find the Right Viagra Dose for You

What effect does each Viagra dose have?

Last reviewed: 24 Jun 2019

1 pack of 4 50mg Viagra sildenafil citrate film-coated oral tablets
Contents of this article

There are 3 doses of Viagra: 25mg, 50mg, and 100mg. The dose refers to the amount of the active ingredient, sildenafil citrate, that’s in each Viagra tablet. You should not take more than 1 Viagra tablet a day.

Most people with erectile dysfunction start on 50mg and then try a different amount if that’s not right for them.

Viagra usually starts to work between 30 and 60 minutes after you take it. But it can take some time for your body to respond to Viagra. You should try Viagra on at least 8 different days, to see if it starts to have any effect. It’s worth sticking with one dose for that long before you think about switching.

You may also want to try a different dose if you’re experiencing a lot of side effects.

Who should take 50mg Viagra?

For most people, 50mg is the first dose a doctor will prescribe. It’s also the most common dose for people to take regularly. A lot of people find that it’s enough to improve their erections.

Who should take 25mg Viagra?

25mg is the lowest available dose of Viagra. A doctor might recommend this if you get side effects from taking the 50mg dose.

For some people, 25mg dosage is a safer option. This might be the case if you’re also taking certain types of treatments, like those for HIV (HIV protease inhibitors) or high blood pressure (alpha blockers).

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Who should take 100mg Viagra?

100mg is the highest recommended dose of Viagra. It’s usually prescribed if the 50mg dose does not give you a hard enough erection.

When you take a 100mg dose of Viagra, you’ll need to keep an eye on any side effects that you might experience. If you do get more side effects with a higher dose, it may not be right for you.

How do I work out the right dose of Viagra for me?

Each person will respond differently to Viagra so you may have to try out different doses to find the right one for you. If you’ve not tried Viagra before, a doctor will usually prescribe a 50mg dose to start with.

If you try 50mg and it works but you get side effects, you could try a lower dose. 25mg can work just as well as 50mg for some people.

If you try 50mg and it does not work, then you could move up to 100mg. You should only move up to 100mg if you’ve not had side effects from 50mg.

It’s worth bearing in mind that it can take up to 8 times of using the medication before it starts to have an effect.

Does it depend on my age?

Age is not generally not a good way to say what dose of Viagra a person will need. As you get older, your body does not get rid of Viagra as quickly, so some men find that a lower dose gives them the same effect. But some men find that they need a higher dose if their ED symptoms get worse as they get older.

Does it depend on my weight?

Being overweight can make erectile dysfunction worse. But, like age, weight is not a good way to say what dose of Viagra you might need.

Which dose works best?

The higher the amount of the active ingredient, sildenafil citrate, in the tablet, the stronger the effects of the medication will be. This means that 100mg will have the most powerful effect. But higher amounts of the active ingredient makes it more likely for people to have side effects.

A doctor will aim to prescribe a dose of Viagra that allows you to have the erections that you want, without experiencing side effects.

Which dose is safest?

A doctor will always prescribe a dose that they feel will be safe for you. A lower dose is likely to cause less side effects than a higher dose.

Can I increase my Viagra dose if it does not work?

Viagra does not always work straight away. It can take up to 8 uses of the medication before it starts to work properly. When it does work properly, you should see an effect 30 to 60 minutes after taking the tablet.

If you’ve tried on 8 different days and the dose you’re taking still does not work, and you’re not having side effects, your doctor may suggest raising the dose. The maximum dose of Viagra you can take is 100mg.

You should not take more than 1 Viagra tablet a day.

What happens if I take too much Viagra?

Taking too much Viagra can cause a number of side effects including:

  • headaches
  • hot flushes
  • feeling dizzy
  • fainting
  • feeling sick (nausea)
  • stuffy nose
  • blurred sight

More serious side effects include:

  • chest pains
  • a long and painful erection (known as priapism)
  • loss of sight
  • skin reaction
  • fits (seizures)

If you have any of these more serious side effects you should go to A&E straight away.

How do I get the most out of my current Viagra dose?

There are a few ways you can make the most out of taking Viagra:

  • Take the tablets in the way your doctor has prescribed
  • Eat lighter meals when you’re using the medication; heavy ones can slow it down
  • Talk to your doctor about any other medication you’re taking to make sure it will not affect Viagra
  • Avoid drinking grapefruit juice or too much alcohol
  • Make lifestyle changes, like following a healthy diet, and not smoking

For any dose of Viagra you’re taking, you should:

  • not take more than 1 tablet of Viagra each day. Taking too much Viagra makes it more likely you’ll have side effects
  • take your Viagra as it’s needed. It can be taken up to 4 hours before sex but most people use it 30 to 60 minutes before

What if none of the doses of Viagra work for me?

It can take some time for your body to respond to Viagra. You should try the tablets on at least 8 different days, to see if they have any effect.

If the medication is not working for you, there are a number of alternatives to Viagra that might want to try:

  • Different types of medication for erectile dysfunction, including: Viagra Connect, Cialis, Cialis Daily, Levitra, and Spedra
  • Treatments that you put on your penis as a cream, or that you inject
  • Lifestyle changes like losing weight, exercising, stopping smoking, drinking little or no alcohol, reducing stress and avoiding illegal drugs
  • Pelvic floor exercises
  • Sex therapy
  • Vacuum pumps
  • Penile implants
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Dr Kathryn Basford is a qualified GP who works as a GP in London, as well as with Zava. She graduated from the University of Manchester and completed her GP training through Whipps Cross Hospital in London.

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Last reviewed: 24 Jun 2019

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