Zydalis 10 Mg Tablet is a medicine used for the treatment of erectile dysfunction (a condition that occurs when a man has difficulty in getting and/or keeping an erection firm enough for sexual intercourse). It is also used to treat urinary symptoms caused due to an enlargement of the prostate gland (a walnut-sized gland located just below the bladder that secretes fluid to nourish and transport the sperm) in older men. This tablet works by relaxing the blood vessels in the penis, increasing the flow of blood to the penis. This medicine also relaxes the muscles present in the prostate gland and bladder thereby, improving the symptoms associated with an enlarged prostate gland. Tablet may cause side effects such as headache, back pain, muscle aches, pain in the arms and legs, facial flushing (redness of the skin of the face), nasal congestion, and indigestion. Most of these side effects are temporary and may subside with time. If any of these side effects persist or worsen, consult your doctor. This tablet can be taken with or without food. The dose and duration of treatment will be determined by your doctor based on your clinical condition. For erectile dysfunction, Tablet should be taken at least 30 minutes before sexual activity. This medicine will help you get/maintain an erection only if you are sexually stimulated. Avoid taking more than the recommended dose. Zydalis 10 Mg or Zydalis 20 Mg Tablet is not recommended for use if you are allergic to it. Inform your doctor if you have liver, heart, or kidney problems, or if you are taking any other medications.