forelimb muscles (mostly group 4 muscles) are mostly either monophasic low or average impetus muscles.
Monophasic use a fixed dose of both estrogen and progestin during the entire cycle.
Reviews of controlled studies have not demonstrated a clear advantage of the newer formulations over the older monophasic drugs.
Monophasic: This combination pills delivers the same amount of hormones during each active pill.
Monophasic pills don't change the levels of progestin and estrogen that you receive throughout the course of a month, except for during the use of the placebo pills at the end of each packet.