This ensures the medication is always in the person’s system and allows for spontaneous sexual activity without planning dosing times. Different brands may not work the same way. Tadalafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension to improve your ability to exercise. BPH : 5 mg by mouth daily. If you remember after 8 hours, skip the missed dose and take the next dose at the usual time Never take 2 doses at the same time.AdGet a Prescription for ED treatment, discreetly deliverED to your door. As needed for ED: 5 to 20 mg by mouth as a one-time dose, with a maximum of one dose in 24 hours. Effects may last up to 36 hours. Daily dosing for ED: or 5 mg by mouth daily. For daily dosing, the maximum dose is 5 mg per day. The medication should be taken once daily at about the same time every day to maintain a consistent .  · Tadalafil (Oral Route) Tadalafil is used to treat men who have erectile dysfunction (also called sexual impotence). Tadalafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where .