Contraceptive film is a translucent 2 inch by 2 inch insert that begins to dissolve instantly with no hormonal side effects. The film contains spermicide that kills sperm on contact. Film, when used by itself, is much less effective than a condom when used as birth control. The film is best used in addition to other forms of birth control. Film is also fairly inexpensive and is best used in addition to another form of birth control.