However, while using this medicine one must know that it does not give protection against HIV, Hepatitis B, gonorrhea, and Syphilis. Tadalafil is sometimes taken as needed, usually at least 30 minutes before sexual activity and not more often than once every 24 hours. There are two different ways to take tadalafil, either daily or on an as needed basis. If you are taking tadalafil to treat PAH or BPH, follow your doctor’s directions and the guidelines in this paragraph. Tadalafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow more easily. Hence, keep your doctors informed about it. Do not take a double dose or more than one dose per day to make up for a missed one.Brand Cialis Generic Tadalafil No data Form Bottle Box Disp Pack Tablet No data Dosage mg 5mg 10mg 20mg No data Quantity 5 6 10 15 30 90 No data. On-demand doses are available in and mg doses. Cialis and tadalafil is the cost. Though prices vary considerably depending on the manufacturer and pharmacy where you’re buying the. Quoted prices are for cash-paying customers and are not valid with insurance plans. This price guide is based on using the discount card which is accepted at most .