Sildenafil is also available through Rex MD for $2 per 20-mg dose or $6 per 50- or 100-mg dose. Shipping is free on all online prescriptions. Rex MD is an online prescription service for ED ...

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 ...