Viagra.

Viagra (sildenafil citrate) is a prescription medication intended for the treatment of ED (erectile dysfunction) and considered to be safe to use by most men. Viagra is not supposed to be combined with alcohol, grapefruit juice and meal high in fat as it may become less efficient or give you unpleasant sensations. Do not take any other medications while using Viagra, especially certain antibiotics, HIV/AIDS medicines, conivaptan, bosentan, cimetidine, blood pressure medications, diclofenac, enoxacin, antidepressants, rifampin, imatinib, or drugs for heart problems before your doctor is notified. This is not a complete list of all the meds that can interfere with Viagra, so you will need to clarify everything with your doctor even if you are using some other over-the-counter or prescription medicine. Mild side effects can include changes in color vision, sensitivity to light, flushing, nosebleeds, burning or tingling in the arms, insomnia, diarrhea, muscle aches, heartburn, or headache, and they vary in intensity for different people. If your erection does not go away after 4 hours and is getting painful – make sure you call your doctor right away or seek emergency help, as this my be a case of priapism that may result in damage to the tissues of the penis.