People looking to buy erectile dysfunction (ED) medications online may wonder where to begin — especially since some medications, like Viagra, require a prescription. There .Brand names Why is this medication prescribed? Yes, ED pills can cause side effects. Do not start these medications while taking sildenafil without discussing it with your healthcare provider. An erection results from an increase in blood flow to the penis. If you experience chest pain, dizziness, or nausea during sexual activity, call your doctor immediately and avoid sexual activity until your doctor tells you otherwise.VIAGRA can cause your blood pressure to drop suddenly to an unsafe level if taken with certain other medicines. Do not take VIAGRA if you take any other medicines called “nitrates.” Nitrates are used to treat chest pain (angina). A sudden drop in blood pressure can cause you to feel dizzy, faint, or have a heart attack or stroke.  · You’ll likely start with a Viagra dose of 50 mg. You’ll typically take Viagra about 1 hour before sex. You can take the drug 30 minutes to 4 hours before you anticipate sexual activity. Store VIAGRA at room temperature between 68°F to 77°F (20°C to 25°C). You can ask your healthcare provider or pharmacist for information about VIAGRA that is written for health professionals. For more information, go to , or call VIAGRA. What are the ingredients in VIAGRA? Active ingredient: sildenafil citrate.Those with pre-existing conditions should always consult a healthcare provider before taking new medications or supplements. Some people may also have ringing in their ears tinnitus or dizziness. The patients in studies had varying degrees of ED. Sildenafil comes as a tablet and suspension liquid to take by mouth. Those who don’t feel comfortable discussing ED with an in-person provider or lack time to visit a doctor’s office may find online ED prescriptions beneficial.