Viagra side effects and contraindications

Side Effects

Like all drugs, Viagra can have some side effects. However, with Viagra, side effects are usually mild and of short duration.

The most common side effects are headaches and facial flushing. Other reported side effects include a runny nose, digestive disturbances and a blue tinge to the vision (cyanopsia), blurred vision or sensitivity to bright light. In the clinical trials, patients usually did not stop taking Viagra because of the side effects. In addition, the occurrence of side effects diminishes over time.

It is worth noting that Viagra is a PDE5 inhibitor. There is some anecdotal (not clinically proven) evidence that rarely, men who have taken PDE5 inhibitors can experience some visual loss or some hearing loss. It is not known whether the visual loss or hearing loss is due to the PDE5 inhibitor or if it has an alternative cause. Nevertheless, if you notice a sudden loss of vision or hearing, stop taking Viagra and see your doctor immediately.

Contraindications

Taking Viagra is absolutely contraindicated if you are also taking any drugs containing nitrates or nitrates. This is because these drugs taken in conjunction with Viagra can cause the blood pressure in the body to fall to dangerously low levels. Drugs that contain nitrates include certain drugs prescribed for the relief of chest pain in angina pectoris. Drugs that contain nitrites include nitric oxide donors such as amyl nitrate, commonly called “poppers”.

Patients taking alpha blockers should also not take a normal dose of Viagra, as alpha blockers taken in conjunction with Viagra may cause low blood pressure and fainting. Alpha blockers include drugs such as Cardura (doxazosin) which are commonly prescribed to treat benign prostatic hyperplasia. Viagra doses above 25mg should therefore not be taken within 4 hours of taking an alpha-blocker. Viagra should not be taken by anyone with a disorder of the retina or certain other rare, inherited eye disorders. It should also not be used if you have ever had loss of vision because of non-arteritic anterior ischaemic optic neuropathy (NAIO).

Viagra should not be taken by anyone with impaired hepatic or renal function, heart failure, uncontrolled high blood pressure, low blood pressure (BP < 90/50) or uncontrolled arrhythmias.

You should not take Viagra if you are allergic to any of the ingredients in the tablet.

You should also not take Viagra in conjunction with any other oral treatments for erectile dysfunction, including Cialis and Levitra.

Tell your doctor

If you suffer from any of the following:sickle cell anaemia, leukaemia or multiple myelomaif you have heart problems. Your doctor needs to be sure that resuming sex will not put your heart under too much strain.if you have a deformed penis or you have Peyronie’s diseasea stomach ulcer, or blood clotting problems such as haemophilia.

About the Author