A 2007 examine by a couple of Argentinian researchers discovered that Viagra helped reset a hamster's circadian rhythm quicker. During your Viagra treatment, consider keeping notes on any unwanted side effects you’re having. Taking Viagra and having intercourse might put an excessive amount of strain on your heart. If you’ve ever had these problems, taking Viagra and having intercourse might put too much strain in your heart. Forty five minutes after taking it, then eat a mild meal, and have intercourse anytime (within a few hours) after that gentle meal. Indeed, it was on March 27, 1998, that the Food and Drug Administration gave the inexperienced light to sildenafil, beneath the model title Viagra, to deal with erectile dysfunction. You might also have blurred vision or elevated sensitivity to light. When Viagra doesn’t work, you might feel annoyed. When you've got a severe headache or a headache that doesn’t go away, talk with your physician. The drug doesn’t trigger unwanted effects in most individuals, however certain unintended effects are possible.