Tamsulosin extended-release tablets side effects, the symptoms usually disappear after stopping the drug, if the symptoms are serious, give relevant treatment, such as allergies, cetirizine can be given as prescribed by the doctor. Tamsulosin extended-release tablets are a medication commonly used to treat difficulty in urination caused by an enlarged prostate. It may cause adverse reactions during administration. 1. Cardiovascular system: headache, dizziness, lowered blood pressure, increased heart rate may occur, stop taking the medicine immediately, rest, monitor blood pressure, observe whether the symptoms improve, if there is no improvement, it is recommended to go to the hospital for treatment. 2. Digestive system: nausea, vomiting, stomach discomfort may occur, usually after stopping the drug, the symptoms can disappear, can also follow the doctor’s instructions to take some drugs to protect the gastric mucosa, such as magnesium aluminum carbonate. 3. Allergic reaction: itchy skin and rash may occur. Generally this symptom, immediately stop the drug symptoms can disappear, if the symptoms are serious, can follow the doctor’s instructions to take anti-allergic drugs, such as cetirizine. Severe cases are recommended to actively seek medical treatment as prescribed by the doctor.