Longtid 20 Tablet contains Tadalafil 20mg, a phosphodiesterase type 5 (PDE5) inhibitor used primarily for the treatment of erectile dysfunction (ED) and symptoms of benign prostatic hyperplasia (BPH). Tadalafil works by relaxing the smooth muscles in the blood vessels of the corpus cavernosum, thereby increasing blood flow to the penis during sexual stimulation, which facilitates the achievement and maintenance of an erection. Additionally, its vasodilatory effects on the prostate and bladder contribute to the alleviation of lower urinary tract symptoms associated with BPH. Longtid 20 is indicated for adult males experiencing difficulty in achieving or sustaining an erection sufficient for satisfactory sexual performance. The onset of action typically occurs within 30 to 60 minutes, with effects lasting up to 36 hours, allowing for greater spontaneity. It should be used under medical supervision, particularly in patients with cardiovascular conditions, as sexual activity may pose a risk. Contraindications include concurrent use of nitrates or nitric oxide donors, which may lead to severe hypotension. Common side effects may include headache, dyspepsia, back pain, and flushing. Patients are advised to follow prescribed dosages and consult their healthcare provider for any adverse reactions or pre-existing conditions before initiating therapy.