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Viagra

Order Your Prescription For Viagra Online

Viagra is a medication for erectile dysfunction. According to a recent study, two out of three men who experienced erectile problems reported that taking a PDE-5 inhibitor such as Viagra improved their erection. In most cases, Viagra takes effect within 30 minutes.

You can use your Superdrug Online Doctor prescription to buy Viagra at any pharmacy in Ireland.

Use our online assessment to order. A Superdrug Online Doctor will complete your prescription and we'll post it to you.

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How does Viagra work?

Viagra is a commonly prescribed medication for the treatment of erectile dysfunction. Its active ingredient is sildenafil, a PDE-5 inhibitor. Originally trialled as a medication for a heart condition, it was found to work better for erectile dysfunction. Viagra is the best-known of all the branded erectile dysfunction medications.

Viagra works by relaxing the blood vessels and improving the blood flow to the penis, which makes it easier to achieve and maintain an erection. It will not work if you are not sexually aroused.

Who is Viagra for?

Viagra is used to treat erectile dysfunction, a common condition in men. Most men experience difficulties getting an erection at some stage in their lives, which can have physical or psychological causes. Possible underlying causes of erectile dysfunction can include physical conditions such as diabetes or psychological factors such as anxiety and stress.

You should be cautious if you have other health problems, especially if you’re already taking medication for another condition. For example, Viagra shouldn’t be taken with a few medications to treat heart and lung conditions.

Can I buy Viagra online?

Superdrug Online Doctor offers a safe way to order a prescription online. A fully qualified and UK registered doctor will assess your medical information and history. If Viagra is suitable for you, you will receive a prescription, which you can use to buy Viagra at your local pharmacy. 


The majority of websites that claim to sell Viagra online without requiring a prescription are unlicensed or illegitimate. You are putting yourself at risk by buying those products.

Avoid unlicensed “alternative options” to Viagra, including “herbal” treatments such as Kamagra as they often fail to work, are produced and sold without quality checks and may cause more harm than good.

Can I buy Viagra over the counter?

As Viagra is a prescription-only medication, it is not available over the counter. Before you can take Viagra, you need to attend a consultation with a doctor or nurse who is qualified to prescribe.

Another way to get a Viagra prescription safely is to use an online doctor service such as ours.

Like most prescription-only drugs, Viagra is not suitable for everyone and it is important that a doctor or nurse assesses whether it is suitable for you before you take it. Beware of Viagra tablets sold in pubs or in clubs, these are often fake and could be harmful to your health. 

There is a non-prescription version of Viagra called Viagra Connect that is, as of yet, not sold in Ireland.
How much Viagra should I take?

Viagra tablets come in different dosages, ranging from 25mg to 100mg. Most men are initially prescribed the 50mg dose, which is neither the strongest nor the weakest dose. 

Older patients may be prescribed a lower dosage, as the side effects of a higher dose may be more likely to affect them. If you are initially prescribed a 25mg dosage and this does not work as intended, you may require a 50mg dosage. However, it is advisable to try the lower dosage several times, as psychological issues including nervousness and stress may be playing a part in your erectile problems. Therefore, you may find that upon using the lower dosage for the second or third time, you will be more relaxed and it may work properly.

Should I take another Viagra tablet if it doesn't work?

If Viagra does not have the desired effect, please reach out to your doctor to confirm whether you can switch to a higher dosage. Do not attempt to take more than one dose of any strength within a 24-hour period unless advised to do so by your doctor, as this can result in serious side effects and could cause damage to your penis. If an erection lasts over 4 hours, seek help from a doctor immediately.

How do I take Viagra?

Viagra, like many other tablets, can be taken with a glass of water. It should not be taken with alcohol, as this can cause side effects, especially in men who suffer from conditions affecting the heart, liver or kidneys. Alcohol also makes it more difficult for most men to get and maintain an erection.

Viagra can take much longer to have the desired effect if you take it shortly after eating a large meal, as this slows down the metabolic process in your stomach. Eating fatty foods such as fast food may make this process very slow, so it is recommended to take Viagra on a nearly-empty stomach or several hours after a meal if you want it to take effect as soon as possible.
It is very common for Viagra to cause headaches. This side effect affects up to 1 in 10 men who use Viagra.

Common Viagra side effects include redness or flushing and indigestion. Some men also report having a stuffy nose, feeling dizzy, nausea, back pain, muscle pain or experiencing visual disturbances when taking Viagra.

Less common side effects:

  • Skin rash
  • Vomiting
  • Bleeding at the back of the eye
  • Bloodshot or red eyes, eye irritation, eye pain, double vision, abnormal sensation in the eye, watery eyes
  • Pounding or rapid heartbeat
  • Feeling sleepy
  • Reduced sense of touch
  • Vertigo and ringing in the ears
  • Nausea, dry mouth
  • Presence of blood in semen and/or urine, penile bleeding
  • Chest pain
  • Tiredness
  • Muscle pain
Rare side effects

  • High blood pressure
  • Low blood pressure
  • Heart attack, irregular heartbeat
  • Fainting, stroke
  • Nosebleed
  • Sudden decrease or loss of hearing 
Viagra is not suitable for you if:

  • You are using protease inhibitors
  • You have certain types of cancer, such as myeloma and leukaemia
  • You have haemophilia 
  • You have sickle cell anaemia
  • You have a stomach ulcer
  • You are taking anti-fungal medicines (for example Ketoconazole or Itraconazole)
  • You are taking medicines such as Quinidine, Procainamide, Amiodarone or Sotalol to treat arrhythmia
  • You are taking macrolide antibiotics like erythromycin or clarithromycin
  • You have an unusually shaped penis (e.g. angulation of the penis or Peyronie's disease)
  • You have problems with your heart or cardiovascular system
  • You have a problem with your kidneys or liver
  • You are allergic to sildenafil or any other ingredient in Viagra
  • You are under 18
  • You suffer from high or low blood pressure levels
  • You have a family history of retinitis pigmentosa or non-arteritic ischaemic optic neuropathy
  • You are taking other erectile dysfunction drugs
  • You are taking nitrates or nitric oxide donors
  • You are female
Consult a doctor immediately if:

  • An erection lasts for more than 4 hours
  • If you experience chest pains during or after intercourse
  • You experience changes in your vision or hearing
Do not operate machinery if you feel dizzy following treatment.
To get a prescription for another PDE-5 inhibitor, visit our page about erectile dysfunction treatment.