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This drug can cause angioedema
which is swelling of the lips, face and sometimes throat which can cause trouble breathing. It can also cause itching. If the lip is not painful, you may try taking an antihistamine over the counter to see if it reduces. If not it may need a few days time to come down for which you may need to consult your Doctor. Eat plenty of fresh fruits and vegetables. Drink plenty of water. Ask your Doctor if you are allergic to this drug to prevent adverse reaction if you ever need IV Clarithromycin
or it's family of drugs and it can be fatal. Prevention is best.