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ED Pharmacy

Erectile Dysfunction treatment made simple

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Product Description

  • Generic version of Viagra
  • For Male Erectile Dysfunction
  • Only to be taken as and when required, 30-60 minutes before sexual activity
  • Not to be used with other erectile dysfunction treatments


Further Information

Sildenafil belongs to the family of drugs called phosphodiesterase type 5 inhibitors. Sildenafil alleviates erectile dysfunction by stimulating blood flow to the penis allowing for firmer, longer-lasting erections.

Sildenafil is the generic name for the drug Viagra and is used to treat erectile dysfunction. The patent for Viagra ended in 2013 meaning that the original manufacturer of Viagra, Pfizer, no longer owns the sole rights to manufacture, although they retain the brand name. By choosing Sildenafil, the active ingredient in Viagra over the branded option, patients will achieve the same results.


  • There are three strengths of Sildenafil currently available; 25mg, 50mg and 100mg tablets.
  • The starting dose for Sildenafil is typically 50mg to be taken 30-60 minutes before the onset of sexual activity and most patients find this dose to be effective. Should this dose be ineffective for patients, the dose can be increased to 100mg. Alternatively, the dose may be reduced to 25mg if the 50mg is felt too strong.
  • It is recommended that Sildenafil be taken on an empty stomach to achieve maximum efficacy. When taken with food, the drug’s rate of absorption decreases, which may delay the desired effect.
  • The effects of Sildenafil can last between four and six hours when taken correctly.
  • Sildenafil should not be taken by anyone under the age of eighteen or by those who experience no trouble in achieving an erection.


Sildenafil vs Tadalafil 

Bodies respond differently to different medications and you may find that Sildenafil does not suit your needs. If this is the case, there are alternative erectile dysfunction medications available. You may find that your body reacts more positively with one of these medicines instead of Sildenafil.

Both drugs can be very effective in treating erectile dysfunction if used correctly. However, Sildenafil has proven to be more time restrictive than Tadalafil. Where Sildenafil will work for up to six hours, Tadalafil’s effects can stay in the system for up to thirty-six hours meaning that with sexual stimulation you will still be able to achieve an erection in this time.

One of our clinicians can help you decide which might be more suitable for you, simply give us a call or drop us a message and we will be happy to help.


Sildenafil vs Viagra

Patients should notice no difference between these two medicines other than price. The active ingredient within is Sildenafil. Viagra is simply the branded version of Sildenafil therefore clinically they are the same.


Side Effects of using Sildenafil

As with all medications, Sildenafil can have unpleasant side effects even when taken correctly, please read the information leaflet for further details. The most common of these are:

  • Muscle or back pain
  • Nasal congestion
  • Diarrhoea
  • Nausea
  • Gastrointestinal discomfort
  • Headaches
  • Flushing

These side effects are not cause for great concern and should last only a short time. Once the effect of the drug wears away these should subside. However, if you experience any of the following uncommon side effects then you should seek medical attention immediately:

Priapism – a painful erection that will not go down. If your erection lasts for more than four hours, contact your nearest medical centre or out-of-hours service for help.

Any severity of vision loss – Visual disorders is a potential common side effect of ED medication. However, a sudden loss of vision in one or both eyes of any severity requires medical immediate medical attention.

Any severity of hearing loss – Some patients may experience tinnitus (a ringing in the ears) or dizziness after using Sildenafil as well as partial or complete hearing loss. Should you experience any of these, consult your doctor.


To determine if Sildenafil is a suitable treatment for you, please select your preferred option and proceed to the assessment page.

Sildenafil licensed for erectile dysfunction comes as an orally administered tablet in the following three strengths:

25 mg
50 mg
100 mg

When taken orally, Sildenafil may begin to work in as little as 30 minutes. We usually advise taking it approximately one hour prior to sexual activity for best results.

Directions: Take one tablet 60 minutes prior to sexual activity

Can Sildenafil affect fertility?

No, it has no detrimental effect on fertility.

How long will it take Sildenafil to work?

Sildenafil tablets should begin to work within 30-60 minutes. Sexual stimulation is needed for Sildenafil to be fully effective. If you eat a large meal before taking Sildenafil tablets, the effects may be delayed.

How long will the effects of Sildenafil last?

The effects of Sildenafil when treating erectile dysfunction last approximately 4 hours. You will still require sexual stimulation for the medicine to work.

Can I drink alcohol with Sildenafil?

As with most erectile dysfunction (ED) medication, alcohol can increase the chances of hypotension (low blood pressure) while increasing your heart rate. It can cause excessive dizziness and fainting. Alcohol is also a contributing factor to erectile dysfunction.

What does Sildenafil look like?

Typically, sildenafil will be a blue tablet. This may vary from one brand to another and can come in different colours and shapes. If you have a brand preference, please contact us to let us know. All our brands are equally as effective and carefully sourced.

How long will the effects of Sildenafil last?

On average the effects of sildenafil can last anywhere between 4-6 hours. You must not take more than one tablet in any 24 hours.

Can Sildenafil tablets be used alongside other erectile dysfunction medication?

No, they cannot. All medications that treat erectile dysfunction work the same way and so using multiple forms at one time can cause an overdose and a higher chance of serious side effects.

What strengths of Sildenafil are available?

Sildenafil tablets only come in three strengths; 25mg, 50mg and 100mg.

Why are there so many companies making Sildenafil tablets?

Due to the patent expiring for Pfizer, other manufacturers have been able to manufacture Sildenafil tablets making them more affordable.

Is Sildenafil legal to purchase online in the UK?

Yes, Sildenafil can be purchased online in the UK from GPhC-approved websites. As we are regulated and approved by the GPhC you can be confident with the request. One of our prescribers will issue a prescription (free of charge) to our in-house pharmacy if deemed suitable.

Can I take Sildenafil if I have a history of heart problems?

As with other drugs used to treat erectile dysfunction, Sildenafil should be used with caution in patients with heart issues. By answering our simple questionnaire, we can determine if it will be suitable.

I take nitrates, can I still buy Sildenafil online?

Unfortunately, not. There is a severe reaction between Sildenafil, nitrate tablets, sprays, and Nicorandil tablets. If you take any of these it is important to inform us so that we can help by suggesting alternatives. The effects of taking nitrates with erectile dysfunction medication can be dangerous.

Is Sildenafil suitable for use in women?

No. Sildenafil and other erectile dysfunction medicines are only licensed for use in men.

Can I use Sildenafil if my partner is breastfeeding?

Preferably not due to the lack of information and research regarding this.

Can I use Sildenafil if my partner is pregnant?

There is no evidence to suggest it is harmful from the studies carried out on animals. However, we only advise using it if the benefits outweigh any potential risks.

Can I drive after taking sildenafil?

Side effects of using sildenafil may include blurred vision and dizziness so you should refrain from driving or operating machinery until you know that the drug does not affect you in any of these ways.

How do I know if Sildenafil is suitable for me?

To determine if Sildenafil is the right drug to help with your erectile dysfunction, you will need to answer a few simple health-related questions. If your consultant deems Sildenafil to be unsuitable, then they will endeavour to offer alternative options and advice. For many, the root cause of ED is not strictly physical. Alcohol consumption, stress and tiredness can also affect your ability to get and maintain an erection.

Chris Morphe

Chris Morphe

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