Take Sildenafil one hour before you plan to have sex, and swallow your tablet whole with water. It should take around 30-60 minutes to work. Never take Sildenafil more than once in any 24 hour period.

Stick to the dose prescribed for you by the doctor. If you take more Sildenafil tablets than you should, seek medical attention.

If you get any serious side effects, go to your nearest emergency room as soon as possible. This includes any signs of an allergic reaction, chest pain, or an erection that lasts for four hours or more and won’t go away on its own.

Sildenafil remains active in the body for up to five hours. As long as you time taking the tablet correctly, you should have plenty of time to have sex with your partner. If you find it doesn’t last long enough for you to have sex, you should consider speaking to your doctor about a different dose.

There are no known interactions between Sildenafil and alcohol, but you should avoid drinking too much because alcohol can make erectile dysfunction worse.

Grapefruit juice can have an enhancing effect on many medications, including Sildenafil. This can increase the risk of side effects, so grapefruit juice should be avoided if you are taking any medicines.

There are three tablet doses for Sildenafil: 25mg, 50mg and 100mg.

Your doctor will normally advise Sildenafil 50 mg if you’re a first time user.

Sildenafil 25mg is recommended for men who have taken the 50mg but experienced mild side effects like a headache or stomach ache, or men who are advised to start on a lower dose because they have a medical condition that makes side effects more likely.

If you take the Sildenafil 50mg dose but it isn’t strong enough (you get an erection but it doesn’t stay hard for very long) your doctor might advise increasing your dose to Sildenafil 100mg.

For most men who take Sildenafil, it normally works on the first use. For others it may work on the second use.

The effectiveness of Sildenafil has been reviewed in clinical studies. It helped to improve erections in:

• 63% of men using the 25mg dose
• 74% of men using the 50mg dose^[2]
• and 82% of men using the 100mg dose.

If you take Sildenafil but it doesn’t work as well as you’d like it to, your doctor will be able to help you find a more suitable dose (or advise another treatment if necessary).

The side effect reported most is headache (1 in 10 or more users). Facial flushing, stuffy nose, blurred vision and an upset stomach are other common side effects (1 in 10 or fewer users).

Sticking as closely as you can to the instructions will help to lower the risk of side effects.

There are things you can do to relieve some side effects, like drinking plenty of water to prevent a headache or taking a mild painkiller. Lozenges can help to unblock a stuffy nose.

If you have any side effects that are more of a problem, speak to your doctor. Reducing your dose may help to stop these.

Serious side effects need medical attention immediately.

If you get any side effects that concern you, see a doctor. Go to hospital right away if you notice: an erection that lasts continuously for four hours and won’t go away; any symptoms of an allergic reaction like hives or a swollen face or throat; sudden vision problems or hearing loss; or a tight feeling or pain in the chest.

Sildenafil is a generic medication, so it will be less expensive. Some people call Sildenafil ‘cheap Viagra’ for this reason, but it does the same thing in the body and is usually just as effective.

Viagra is a branded medication from Pfizer, and the tablets have a distinct blue appearance and some in a recognisable box. Sildenafil isn’t always made by Pfizer, so the appearance of Sildenafil pills can vary between manufacturers. 

Some men prefer Viagra over the Sildenafil generic. But the two drugs are clinically bioequivalent, which means there’s little to no difference between them in how well they work.

Tell your prescriber. They’ll be able to suggest a different dose or an alternative drug. As an EveAdam subscriber, you can login and do this any time, by dropping the prescriber a message. Adjusting your subscription plan is easy if you want to switch to a different treatment. 

So if in the first instance you choose to buy Sildenafil but find it doesn’t work well for you, you have the option to switch treatment later on.

It depends on the person taking it and what their sexual habits are. Even though they work in a similar way, the two are quite different. Tadalafil, the generic version of Cialis, is available as an on-demand weekend pill (that lasts for up to 36 hours) or a low dose every day pill.

Sildenafil is an on-demand pill that lasts for up to five hours. It is usually a little cheaper than Tadalafil, and for some men who don’t want to take medication every day, this length of time is enough.

No, neither Sildenafil nor drugs in the same class are suitable or safe for women to take. There is a drug often referred to as the ‘female Sildenafil’ called Addyi, and is for hypoactive sexual desire disorder (HSDD). But it is in no way similar to any licensed erectile dysfunction drug.