If you are unable to achieve a strong erection during sexual activity. You are suffering from a sexual problem. Most of the men in the world are suffering from sexual problems. Such people should take tadalista 40 medicine. A single dose of this drug gives a very good result in achieving an erection. This drug relaxes the blood vessels in the penis of men slowly and helps to achieve a strong erection for a long time. The drug usually starts working in 30-40 minutes and lasts for 36 hours.