While Lemonaid says that its pharmacies stock branded Viagra, its website goes into much more detail about the 20-mg sildenafil pills that provide many of the same benefits as Viagra for a lower cost.

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 ...

Revatio and Viagra contain the same active ingredient ... Ages 18 and up (suspension or tablet): 20 mg by mouth three times a day; if needed, the maximum dose is 80 mg three times daily.