Both options require valid medical documentation, but some online services only require a health questionnaire to be filled out and reviewed for approval—meaning no face-to-face video interaction is needed. Do not take a double dose to make up for a missed one. In addition, consider the information below. Those with pre-existing conditions should always consult a healthcare provider before taking new medications or supplements. For treatment of pulmonary arterial hypertension: Adults—40 milligrams mg two 20 mg tablets taken once a day. Both medications are generic now and can be found at discounted rates, making them more accessible to the public than ever before. · Cialis (tadalafil) is prescribed to treat erectile dysfunction and symptoms of benign prostatic hyperplasia. It comes as a tablet that’s taken as needed or once per day, depending on the.  · The maximum dose of Cialis that can be taken in a day is 20 mg. You should not take Cialis more than once a day. In clinical trials, Cialis helped people with ED symptoms for up to Tadalafil under the name of Cialis is used to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate). Another brand of tadalafil is Adcirca, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women.