Hi.. Welcome to HEALTHCARE MAGIC.. As per your query twitching of lip or lip quiver can occur as a side effect of medication and although lip twitch is nit a common side effect but can occur due to it.. Other causes that can also commonly cause quiver of lips are Vitamin B12 and calcium deficiency, potassium deficiency, traumatic injury or inflammation of facial nerve that supplies muscles of face,anxiety and panic attacks, nerve inflammation and infection caused by viruses etc.. I would suggest you to first of all consult your treating Physician and get evaluated and a thorough clinical evaluation can help in diagnosis.. In case if medication side effect is culprit then stopping the intake of medication will help.. In case if medication is not the cause then you will be advised to get investigations done like MRI, CT Scan, Nerve conduction studies, Electromyogram etc to rule out the exact cause of the problem and treat you accordingly.. You can be advised to take multivitamins along with calcium and potassium supplements.. You can do warm compresses over the lips. You can also do breathing exercises along with meditation to keep stress minimal.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.