Tadalista 40 mg contains tadalafil, its effects can potentially last up to about 36 hours after a dose. This does not mean you will have an erection continuously; tadalafil helps you achieve an erection in response to sexual stimulation during Tadalista 40 Mg period. The actual duration can vary with factors such as metabolism, other medicines, health conditions, and individual response. Important: 40 mg is above the FDA-labeled maximum as-needed tadalafil dose of 20 mg, so it should only be used if specifically prescribed by a healthcare professional. If an erection lasts more than 4 hours, seek emergency medical attention.