Nicorette Invisi Extra Strength Patch is an aid to help smokers give up cigarettes. This Nicotine Replacement Therapy (NRT) helps to relieve withdrawal symptoms and cravings associated with stopping in intake of nicotine. The 25mg patch works over a 16-hour period to help smokers of more than 20 cigarettes a day. Nicorette patches release nicotine slowly through the skin. You Must Be Aged Over 18 Years to Purchase This Product