Here is a breakdown for Synthergine -
[Usage: 1ml per 55lbs (25kg) of bodyweight per day split in 2 even doses and taken 8-12 hours apart. eg. a 100kg athlete would need a dose of 4ml that would be split into 2 x 2ml etc.]
You can inject SQ or IM. Depending on how many injections I am already doing a week, I would go IM.