Tadalafil's most unique and identifying characteristic is its long half-life of 17.5 hours, compared with 4 hours for sildenafil (Viagra) and vardenafil (Levitra).
ຄຸນລັກສະນະທາງວິທະຍາສາດທີ່ໂດດເດັ່ນຂອງ Tadalafil ແມ່ນໄລຍະເຄິ່ງຊີວິດຂອງຕົນ (17.5 ຊົ່ວໂມງ) ເມື່ອທຽບກັບ Viagra ແລະ Levitra (4-5 ຊົ່ວໂມງ).