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PDE5 inhibitors, including Cialis, and alpha-adrenergic blocking agents are both vasodilators with blood-pressure-lowering effects. When vasodilators are used in combination, an additive effect on blood pressure may be anticipated. Clinical pharmacology studies have been conducted with coadministration of tadalafil with doxazosin, tamsulosin or alfuzosin. Overall, approximately 0.5% of all subjects treated with Cialis for on demand use discontinued treatment as a consequence of back pain/myalgia.

Brand-name versions of the drug approved for PAH include Adcirca. Once-daily dosing has not been studied in patients with hepatic impairment