Megalis 20 mg, which contains tadalafil, is used to treat erectile dysfunction (ED) and sometimes benign prostatic hyperplasia (BPH). Common side effects associated with Megalis 20 mg include:

Headache: A frequent side effect, often mild and temporary.

Flushing: A warm or red sensation in the face or upper body.

Indigestion: Discomfort or pain in the stomach area, sometimes referred to as dyspepsia.

Back Pain: Muscular pain in the back, which can occur shortly after taking the medication.

Muscle Aches: General muscle discomfort or soreness.

Nasal Congestion: Blocked or stuffy nose.

Dizziness: A feeling of lightheadedness or unsteadiness.

Vision Changes: Altered vision, such as seeing a blue tint or having difficulty distinguishing between colors (rare but can occur).

Runny or Blocked Nose: Nasal symptoms can occur.

Painful Erection: In rare cases, prolonged or painful erections (priapism) can occur. This requires immediate medical attention if it lasts more than 4 hours.

Most side effects are mild and temporary, but if you experience severe or persistent symptoms, it's important to contact your healthcare provider. Additionally, if you have any pre-existing health conditions or are taking other medications, discuss potential interactions and risks with your healthcare provider to ensure safe use of Megalis 20 mg.