The usual medications prescribed for nicotine addiction are 1. Nicotine Replacement Therapy-some substances which contain small amounts of nicotine (Nicotine lozenges/chewing gum,trans dermal nicotine patch, nicotine nasal spray) are administered or applied, and, 2.Oral administration of Non-Nicotine medications like Varenicline, Bupropion etc, which are actually anti-depressants. Counseling, support groups etc. are non-medical means.
The commonest way to treat nicotine addiction is to substitute the delivery method from a cigarette to a patch. Then, the patient can taper off the dosage administered by the patch. Nicotine can also be delivered with an inhaler. Another drug is Buproprion, which also is used as an antidepressant. It is often referred to as Zyban.
There are many different products prescribed for nicotine addiction. Two very common products that can be bought over the counter are nicotine patches and nicotine gum. Other products that can't be bought over the counter are chantix and wellbutrin.