Blister packs are commonly used as unit-dose packaging for pharmaceutical dosage forms such as tablets, capsules or lozenges. Blister packs can provide barrier protection for shelf life requirements, and a degree of protection where product tamper resistance is a consideration. In the USA, blister packs are mainly used for packing physician.

samples of drug products or for the sale of Over The Counter (OTC) products in the pharmacy. In other parts of the world, blister packs are the main packaging type since pharmacy dispensing and re-packaging are not common. A series of blister cavities is sometimes called a blister card or blister strip as well as blister pack. In some parts of the world the blister pack is known as a Push-Through-Pack (PTP). Main advantages of unit-dose blister packs over other methods of packing pharmaceutical products are the assurance of product/packaging integrity (including shelflife) of each individual dose and the possibility to create a compliance pack or calendar pack by printing the days of the week above each dose. Blister packs are created by means of a form-fill-seal process at the pharmaceutical company or designated contract packer. A form-fill-seal process means that the blister pack is created from rolls of flat sheet or film, filled with the pharmaceutical product and closed (sealed) on the same equipment. Such equipment is called a blisterline. Blister packs comprise of two principal components : 1) a formed base web creating the cavity inside which the product fits and 2) the lidding foil for dispensing the product out of the pack. There are 2 types of forming the cavity into a base web sheet: thermoforming and cold forming..