Tadalafil tablets for pulmonary hypertension are large and may be difficult to swallow. The strength and dosage instructions can vary. We can also prescribe the non-branded versions of these: Sildenafil brand name Viagra , Tadalafil brand name Cialis and Vardenafil brand name Levitra. Do not take more than 1 tablet a day. The usual dose is 5mg, taken once a day.LloydsPharmacy Online Doctor can help you find the right erectile dysfunction treatment and strength to help support a fulfilling sex life and improve your erectile performance in a way that suits you. All treatments are sent in plain, unbranded packaging to your chosen address, or local ParcelShop for convenient collection. How and when to take tadalafil Brand names: Cialis, Adcirca It’s important to take this medicine as advised by a doctor or pharmacist. If you have a private prescription for tadalafil, read the information that comes with your medicine carefully. The strength and dosage instructions can vary. Dosage and strength. Tadalafil: a medicine for erection problems, pulmonary hypertension and enlarged prostate – NHS Home Medicines A to Z Tadalafil Brand names: Cialis, Adcirca Find out how tadalafil treats erectile dysfunction, pulmonary hypertension and benign prostate enlargement, and how to take it. About tadalafil Who can and cannot take it.