Headache is the most common, and stuffy nose and facial flushing are quite common too. Okay, so a bit of background on erections. If you prefer, you may contact the U. Some men are okay with these side effects, and find signs like facial flushing reassuring because it helps them to know the drug is working. Some people may also have ringing in their ears tinnitus or dizziness. When a man gets aroused, the brain sends signals to the body that tell vessels supplying the penis to open up. Taking acetaminophen and drinking plenty of water can help with a headache if Viagra otherwise works fine.What to consider Cost Overdose Ask your doctor Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take . Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in is also used to treat pulmonary arterial hypertension, a serious heart and lung . SILDENAFIL CITRATE (Generic for VIAGRA) QTY 30 • MG • Tablet • Near EDIT; Add to Medicine Chest; Set Price Alert; Select at least one Pharmacy. Enter Email .