These small differences affect the way each medication works, such as how quickly it takes effect and wears off, and the possible side effects. 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. Is 20mg of Cialis better than mg of Viagra? Viagra is always taken as needed, usually an hour before having sex. Common ones include: Flushing of the skin.Viagra Alternatives Compared. Viagra (sildenafil) Cialis (tadalafil) Sildenafil. Prescription only. Viagra is used to treat erectile dysfunction (ED), but will not have any effect in the . Viagra: How a Little Blue Pill Changed the World; Care guides. Erectile Dysfunction; Symptoms and treatments. Over-the-counter. Rx/OTC: There is positive evidence of human fetal risk based on adverse reaction data from investigational or marketing experience or studies in humans, but potential benefits may warrant use in pregnant . What is the closest thing to Viagra over-the-counter? There are no over-the-counter alternatives to Viagra. However, people may wish to try natural supplements that people .

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