Cialis tadalafil : This ED medication works with the same principle as Viagra, but lasts up to 36 hours. In some cases, ED can cause a strain on relationships and impact self-esteem. These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. In some cases, online ED providers accept health insurance. It’s available in 10 mg and 20 mg tablets.Brand name: $ to $1, for ten to thirty 10 mg tablets Generic: $ to $ for ten 10 mg tablets But your out-of-pocket cost for Levitra may depend on a few different factors that can. Levitra 20 mg tablet. Medication name. Uses How to use Side effects Precautions Drug interactions Overdose Notes Missed dose Storage Important note. Information last revised August Levitra (vardenafil hydrochloride) is an oral medication taken to treat erectile dysfunction (ED). It’s in the same class of drugs as other popular ED medications, including Viagra and Cialis.