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. Most companies have an FAQ or shipping policy page you can reference to learn whether discreet packaging is available. 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. Most online pharmacies do not prescribe or refill controlled substances, like Adderall, Xanax, or oxycodone. Those with a history of blood pressure or heart issues, hormonal imbalances, mental health issues, and diabetes should consult their doctor before trying PDE5 inhibitors. When a man gets aroused, the brain sends signals to the body that tell vessels supplying the penis to open up.Sildenafil (Viagra) is only approved by the FDA to treat erectile dysfunction in males. While some studies did look at the use of sildenafil (Viagra) in females, more . Where can I buy Viagra®? In the United States, you can get Viagra® from most major pharmacies and online with a prescription. While you cannot simply “buy” Viagra® over . Viagra, Cialis, sildenafil, tadalafil: Yes: Lemonaid Best for Cialis: Starting at $2 to $8 per pill: Yes: Sildenafil, tadalafil (as-needed and daily) Yes: Roman Best for .