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Sold under various trade names such as Viagra, Revatio and so on, Viagra, generically known as Sildenafil citrate, is a popular drug that is used to treat erectile dysfunction (ED) and pulmonary arterial hypertension (PAH). Developed and marketed by the pharmaceutical company Pfizer, the drug works by inhibiting cGMP specific phosphodiesterase type 5, an enzyme that administers blood flow in the penis. Available since 1998, this proven FDA approved medication is apt for males who are unable to maintain harder erections. Its primary competitors available on the market are tadalafil (Cialis) and vardenafil (Levitra). Like other drugs, Viagra has some disadvantages irrespective of treating erectile dysfunction.
Advantages of Viagra
There are a number of advantages associated with Viagra. Some of them are as follows:
- Non-invasive
- Easy to employ
- Safe with only some mild side-effects
- Helps in long-lasting erections
Disadvantages of Viagra
It is advised to administer the drug after due consultation with your healthcare provider as the drug may cause the following side-effects:
- Erections may not be as rigid, expected, or long lasting as required
- Takes up to an hour before to act, a delay that can dampen spontaneity
- Should be employed only once in any 24-hour period
Some more mild side effects that may occur, including:
- Headache
- Facial flushing
- Indigestion
- Dizziness
- Stuffy nose
- Blue-tinged or blurred vision, and sensitivity to light
Before Taking Viagra
It is recommended to consult your physician before taking Viagra as the physician is the right source to decide whether you are an eligible candidate or not for taking Viagra. Tell everything briefly related to your health. If you have any heart disease or heart rhythm problems, a recent history of a heart attack or stroke, congestive heart failure, high or low blood pressure, liver disease, kidney disease, a stomach ulcer, or a physical deformity of the penis, then you need to inform your healthcare provider so that he/she will decide your eligibility. It is also suggested to avoid missed doses of the drug.  
Missed dose of Viagra
If you forget to administer the drug on time, then administer the drug as soon as you remember. If it is almost time for your next dose, then skip the missed dose and administer the drug as per daily routine. It is advised not to take the drug to make up the missed dose. Apart from missed dose, one also needs to avoid overdose.
Overdose of Viagra
One needs to rush for medical help if he could have administered the drug more than prescribed. Some of the symptoms of overdose include chest pain, nausea, irregular heartbeat, and feeling light-headed or fainting.
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