Generally, Viagra and generic sildenafil are well-tolerated, with few severe side effects. The most commonly reported side effects include headaches, indigestion, and facial or bodily flushing, though these are not widespread.
Potential side effects to be aware of are:
- Headaches
- Indigestion
- Flushing
- Nausea
- Dizziness
- Rash
- Low blood pressure
- Nasal congestion
- Back pain
- Abdominal pain
- Blurred vision or blue-tinted vision
- Priapism (an erection lasting longer than four hours)
It is crucial to consult your doctor about any medications you are currently taking before starting Viagra or sildenafil. These drugs can interact with other medications and lead to serious health complications.
If you fall into any of the following categories, it is advised to speak with a healthcare provider, as sildenafil or other PDE5 inhibitors may not be suitable for you:
- Are over 65 years old
- Take nitrates, such as nitroglycerin
- Have an existing heart condition
- Take alpha blockers for high blood pressure
- Have been diagnosed with Peyronie’s disease
- Have tinnitus
- Have liver or kidney disease
- Have sickle cell anemia
Viagra and Sildenafil Dosage
Viagra is available in three strengths: 25mg, 50mg, and 100mg, with most patients beginning treatment at 50mg. Sildenafil, the generic equivalent, also comes in 25mg, 50mg, and 100mg tablets. Additionally, a 20mg dosage is available when sildenafil is marketed as the generic form of Revatio, which is FDA-approved for treating pulmonary arterial hypertension (PAH) but can be used off-label for erectile dysfunction (ED).
The question arises, is 20mg of sildenafil (generic Revatio) equivalent to 25mg of Viagra? While a single Revatio tablet contains 20mg, multiple tablets may be prescribed for ED to achieve doses of 40mg, 60mg, 80mg, or even 100mg.
Your healthcare provider will determine the exact dosage of either brand-name Viagra or generic sildenafil suitable for you if you’re prescribed these medications.
Since both brand-name Viagra tablets and generic sildenafil contain the same active ingredient, they are expected to deliver identical results from doses ranging from 25mg to 100mg, typically used for ED.
Both Viagra and sildenafil are most effective when taken at least 30 minutes to an hour before sexual activity, but no more than four hours in advance. They can be taken with or without food, though it’s best to avoid high-fat meals as they can delay the onset of action.
If Viagra or generic sildenafil does not improve your erectile function, do not increase the dosage on your own. Instead, consult your healthcare provider, who may adjust your dosage or suggest an alternative ED medication. While sildenafil and other PDE5 inhibitors like vardenafil (Levitra) function similarly, they differ in dosage, with Levitra typically prescribed in lower doses but not necessarily being stronger than Viagra.
