Dectomax is an injectable it is mostly used in cases of sheep scab either to prevent in the case of new sheep coming on to the holding,or to treat an outbreak, it also treats worms but straight wormers are cheaper . Heptavac is used to prevent clostridial bugs , Heptavac P is the same plus pneumonia, two initial injections 4-6wks apart then an annual booster ,again injectable.