I know you can buy different pills for heart worms, but there really should just be a start up package for people who just got a dog. (caninejournal.com)
Also, don't put different pills in one bottle, as the chemicals could interact. (cnbc.com)
For this reason, some women go through several different pills before finding one with the «right» combination of estrogen and progesterone that enables them to have clear skin. (paleoforwomen.com)