Dosage and cost: Sildenafil is available through Roman by prescription in 25-, 50-, or 100-milligram (mg) pills, ranging in price from $4 to $10 per dose. Brand-name Viagra is also available ...

Daily doses are often between 2.5 and 5 mg. The as-needed dose is usually 10 mg but can range from 5–20 mg. The typical dose ...