Viagra (sildenafil) is a prescription medication used to treat erectile dysfunction. It is a type of drug known as a PDE-5 (Phosphodiesterase type 5) inhibitor and it helps increase blood flow to the penis improving your ability to get and maintain an erection. Viagra is available in three dosages – 25mg, 50mg and 100mg. These figures donate how much of Viagra's active ingredient sildenafil is contained in the tablet.

Similar to any medication, while the benefits exceed the risks of taking Viagra , certain adverse side-effects can be experienced. It is important to understand what the symptoms of these side-effects are, how to reduce your risk of experiencing them and what action to take if you do start to experience any of them. While this article deals with the majority of these, it is not an exhaustive list. For more information, or if you have queries that are not addressed here, speak to your doctor or complete our free online consultation.

Highly Rated Service

3,987 patient reviews

4.8/5
Free Consultation

Our partner doctors will assess your medical history

Confidential Service

Private payment and discreet packaging

Prescription Medications

Dispensed same day by UK registered pharmacies

Available Treatment for Erectile Dysfunction
Viagra 50mg
4.6/5 - 109 Reviews

Viagra

  • Effective for up to 4 hours
  • Works in 30-60 minutes
  • 1st treatment on the market
sildenafil
4.3/5 - 74 Reviews

Sildenafil

  • Lasts for 4 hours
  • Works within 30-60 minutes
  • Same ingredient as Viagra
4.6/5 - 121 Reviews

Cialis

  • 36 hour effectiveness
  • Works in 20-30 minutes
  • Known as the weekend pill
Load More Treatments
Treatment To Your Door In 3 Easy Steps
Complete Your Medical Form
Choose Your Treatment
Free Next Day Delivery

Possible side effects

As a prescription medication, there is a chance of some kind of side effect when taking Viagra, as all people react differently to medication. If any are experienced they usually subside as the body becomes accustomed to the medication, if however an erection lasts for longer than 6 hours then it medical assistance is needed. Below is a list of possible side effects:

Common side effects (about 1 in 10):
Nausea Headaches
Stuffy nose Indigestion
Dizziness Flushed Face
Uncommon side effects (1 in 100 or 1,000)
Drowsiness and extreme tiredness Muscle pain or backache
Dehydration or vomiting Tinnitus – a ringing in the ears
Vertigo – a sensation of spinning Numbness or hypersensitivity to touch and pain
Rapid heart rate or heart palpitations Blood in urine or semen
Skin rashes Pain, discomfort of bleeding in the eye.
Rare side effects (1 in 1000 or 10,000)
Fainting or passing out Sudden loss of hearing
A prolonged or painful erection (priapism) Irregular heart beat or unstable angina
Seizures or epileptic fits Heart attack or stroke
Toxic epidermal necrolysis – severe flaking of the skin Stevens-Johnson Syndrome – extensive blistering of the skin

How to prevent the risk of side effects?

One of the key ways to reduce your likelihood of side effects with Viagra is to reduce your dosage. Studies by Pfizer have shown that the chances of side effects do increase the higher the dosage. Most people start on 50mg tablets, but if you are at a high risk of side effects or you aren't tolerating this dosage, it can be reduced to 25mg.

Before you start taking Viagra (sildenafil), you can also prevent your risk of side-effects by ensuring that you have informed your doctor of all relevant information – including previous medical history, other medications and lifestyle factors.

Disclose any allergies:

Allergic reactions to Viagra (Sildenafil) are unusual, but you should tell your doctor or pharmacist if you have experienced any allergic reactions to it or other medications. While, other allergies may not seem connected, there may be inactive ingredients within Viagra that could spark a reaction.

Disclose other medications:

It is crucial to inform your doctor about all other medications you are taking: prescription, non-prescription and herbal. When drugs interact together, it can change how they work and also increase the risk of side-effects. A doctor will advise whether Viagra (Sildenafil) is safe to take in conjunction with your existing medications.

Viagra can cause a dangerous drop in your blood pressure if it's combined with nitrates, often prescribed to treat chest pain or angina, or alpha blockers, often prescribed to treat high blood pressure.

There is also a range of other medications that can interact with Viagra, that may cause adverse reactions including:

  • azole antifungals
  • macrolide antibiotics
  • HIV
  • Hepatitis C virus
  • protease inhibitors
  • mifepristone
  • rifampin

Extra caution should be exercised if you are on any of these medications, and you should always avoid mixing Viagra with any other erectile dysfunction drugs.

Disclose any underlying medical conditions

This medication is not suitable for everyone. Some underlying medical conditions may put you at an increased risk of side effects. In particular, if you've ever experienced any of the following conditions, you should tell your doctor:

  • High or low blood pressure
  • Kidney or liver disease
  • Stroke, heart problems or circulation problems
  • Painful or prolonged erections
  • Leukaemia, sickle cell anaemia or multiple myeloma
  • Eye problems or sudden vision loss
  • Stomach ulcers

Things to avoid while taking Viagra

When taking thie erectile dysfunction treatment as well as the above steps, it's important to avoid:

  • Excessive alcohol – if you consume more than two units of alcohol can affect how long it takes Viagra to take effect and can cause problems maintaining an erection. This may cause you to take a higher dose than is required, and increase the risk of side-effects
  • Recreational drugs – in particular, drugs such as poppers contain nitrates that can cause a dangerous drop in blood pressure when combined with Viagra

Dealing with Viagra side effects

It is important to discuss any side-effects experienced with you doctor, even minor or common side-effects, as your dosage can be lowered if you're finding it difficult to tolerate. If symptoms persist or worsen, you should contact your doctor immediately.

If you experience any of the rare but more severe side-effects, it's important to stop taking Viagra and get medical help straight away. In particular, you must seek emergency medical help if you show any signs of a heart attack, prolonged erection, sudden hearing or vision loss or an allergic reaction to the medication.

How can I find out if Viagra is right for me?

If you suffer from erectile dysfunction and want to see if Viagra is the right treatment for you, you can find out more information on the treatment page.

Sources: