In some cases, online ED providers accept health insurance. If you prefer, you may contact the U. Some people may also have ringing in their ears tinnitus or dizziness. The most common side effects of VIAGRA: headache; flushing; upset stomach; abnormal vision, such as changes in color vision such as having a blue color tinge and blurred vision; stuffy or runny nose; back pain; muscle pain; nausea; dizziness; rash. Taking generic ED medications is an effective way to save money without sacrificing quality. In some cases, ED can cause a strain on relationships and impact self-esteem. Other warning signs of an unsafe online pharmacy include outdated medication, no customer service, or suspiciously low prices.By Ginger Skinner Last updated: June 14, If you’re looking for a less costly Viagra, you might want to ask your doctor about sildenafil. It’s the active ingredient Missing: sample. Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in adult Missing: sample. For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS See risks & benefits. Learn more about what VIAGRA® Missing: sample.