There are numerous alternatives to "the pill". You can use a sponge, spermicidal foam, spermicidal films, IUDs, NuvaRing, DepoProvera, Norplant or condoms. My suggestion, is the condom. It is the only one that prevents STDs!
An alternative medicine to birth control pills would probably be the "Shot". The birth control shot is given every 3-4 months I believe. Just as effective as the pill..
The most effective alternative to birth control pills is either abstinence or using a condom. Condoms will also help to prevent the spread of sexually transmitted diseases.