Medicine Name: Nicogum 4 Nicotine Gum Chewing Gums Fresh Mint Sugar Free. Composition: Nicotine (4mg). Side Effects: Nausea Hiccup Vomiting Dryness in mouth Flatulence Stomatitis Inflammation of the mouth Pharyngolaryngeal pain Abdominal pain Diarrhea Constipation Cough Insomnia difficulty in sleeping.