1. This drug is contraindicated in patients with known hypersensitivity.
2. Using this drug in patients with hypersensitivity to penicillins can cause severe to fatal allergic reaction.
3. Stop using this drug and immediately consult the doctor when manifesting any signs and symptoms such as fever, skin rash, blisters, detachment of skin and epithelial lining in oral cavity, throat, nose, genital organ and conjunctivitis after taking the drug.