Viagra, whose generic name is sildenafil, cannot be taken again six hours apart.
Sildenafil is a type 5 phosphodiesterase inhibitor, mainly used for the treatment of erectile dysfunction, the medication is often taken on demand about an hour before sexual activity, but the daily dose is at most one time, and can not be taken more than once, if you take it again six hours later, the interval is relatively short, which may lead to certain side effects.
Sildenafil should be taken with the understanding that it is contraindicated for those who are allergic to the components of the drug, and it is prohibited for patients taking any dosage form of nitrate. Adverse reactions such as headache, flushing and indigestion may occur after taking the drug.
The medication must be taken by the doctor’s guidance, the patient should not take the medication on their own, especially to avoid excessive dosage of the medication.