What is Sildenafil?

What is Sildenadfil?

Eddie is a subscription service that delivers Viagra Connect to your door quickly and discreetly.

You might have heard of Sildenafil as an alternative to Viagra for treating erectile dysfunction (ED). Except the difference in colour (Viagra is blue, Sildenafil is white) and price (Sildenafil is usually cheaper), it’s hard to tell what separates the two. So, what actually is Sildenafil?

In fact, Viagra and Sildenafil are the same product, containing the same active ingredient. This means that they work in exactly the same way, have the same side effects, and have the same interactions with other medicines. The difference is that Viagra is the brand name, whereas Sildenafil is the “generic” version, named after the product’s active ingredient. You might see Sildenafil referred to as a generic medicine.

When was Sildenafil discovered?

Sildenafil was discovered as a treatment for erectile dysfunction in the late 90s by Pfizer, and was then branded as Viagra. Because they discovered it, Pfizer got a patent on the medicine, making them the only company allowed to sell it for a set period. Their patent expired in the UK in 2013, at which point Sildenafil came onto the market at a lower cost.

In America, Pfizer’s patent expires in 2020, but Teva Pharmaceuticals have negotiated a contract to began selling the generic version at the end of last year.

It may take up to eight attempts for ED medicines such as Sildenafil to have an effect.

What dosage is Sildenafil available as?

Like Viagra, Sildenafil is available in 25mg, 50mg and 100mg doses. 50mg is the recommended starting dose, but your doctor may suggest that you take the 25mg dose instead if you experience adverse side effects. It can take up to 8 attempts for the medicine to work, but if you’re noticing no effect after this, your doctor may recommend increasing your dose to 100mg. You should only make this increase on your doctor’s recommendation.

Do you need a prescription for Sildenafil?

Yes, you need a prescription from your doctor in order to buy Sildenafil. Taking medicines such as Sildenafil or Viagra will not help you if you’re not experiencing symptoms of ED, and can be dangerous if you take them unnecessarily. Your doctor will also need to make sure it’s okay for you to take the medicine, as certain health conditions can cause unsafe side effects, and it can have dangerous interactions with other medicines.

Can you get ED treatment without a prescription?

Only one ED medicine is available without a prescription - Viagra Connect. In April 2018 it was released as a medicine available over the counter, subject to answering a few questions from your pharmacist. The decision to make Viagra Connect more easily available was due to the huge volume of Viagra being purchased illegally online, risking health and bank details alike. You can now order the medicine online discreetly, or use a service such as Eddie to get a monthly subscription to Viagra Connect.


Eddie is a service that delivers Viagra Connect discreetly to your door. Treatment is available as a monthly subscription or one off purchase, starting from £19.99. Simply answer some questions from our pharmacist and you can purchase Viagra Connect in as little as 60 seconds.

Viagra Connect won’t give you an instant erection. You need to be sexually aroused for it to work and won’t help you if you don’t have ED symptoms.

Content Marketing Officer
Content Marketing Officer
Libby Mayfield

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