In four studies, a single oral dose of tadalafil was administered to healthy male subjects taking daily at least 7 days duration oral alpha blocker. Antihypertensives — PDE5 inhibitors, including tadalafil, are mild systemic vasodilators. In many cases, medical follow-up information was limited. Doxazosin was administered at the same time as tadalafil or placebo after a minimum of seven days of doxazosin dosing see Table 4 and Figure 2. It should not be taken more than once a day.The prices listed are the most recent cash prices. These prices: Do not account for prescription insurance and co-pays; Tadalafil 5 Mg Tab Nort. Mfr. NORTHSTAR. 10 Tablets. 20 Tablets. 30 Tablets. Tadalafil Oral tablet. Tadalafil Oral tablet [Pulmonary Hypertension]. Generic drugs usually cost less than the brand-name version. mg, 5 mg, 10 mg, and 20 Your doctor may increase your dose to 20 mg or decrease it to 5 mg. This depends on how tadalafil. The cost for tadalafil oral tablet 5 mg is around $27 for a supply of 90 tablets, depending on the pharmacy you visit. 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 U.S. pharmacies. Tadalafil prices Oral Tablet.