It's not, used as directed it is one of the most effective methods of Birth Control. Less than 1 out of 100 women will get pregnant each year, while on DepoProvera.
Condoms, IUDs, birth control pills, depot birth control medications (e.g. monthly, or quarterly), morning-after pill methods, contraceptive sponge, cervical cap, sterilization ... and the least effective method of contraception - the "rhythm method".
The calendar method is the least dependable method of contraception (aside from keeping your fingers crossed).
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The contraceptive method least likely to prevent pregnancy when used alone is the withdrawal method, also known as "pulling out." This technique relies on the male partner withdrawing his penis before ejaculation to prevent sperm from entering the vagina. However, it can be highly unreliable due to the potential for pre-ejaculatory fluid containing sperm and the difficulty in timing withdrawal accurately. Other less effective methods include spermicide used alone and fertility awareness methods, which require precise tracking of the menstrual cycle.
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