Monophasic meaning

• A. Same dose of estrogen and progestin throughout the pill pack
• B. Varying dose of estrogen and progestin throughout the pill pack
• C. Only estrogen in all pills
• D. No placebo days

Answer: (A)

Monophasic means the same dose of estrogen and progestin is used in every active pill throughout the pack. This keeps hormone exposure constant across the entire cycle, unlike regimens that vary the dose in different pills (biphasic or triphasic), where the hormone amounts change as you go through the pack. Some packs may include placebo days at the end to maintain a 28-day cycle, but the defining idea is the uniform hormone content among the active pills. The other options don’t fit because varying doses define biphasic/triphasic regimens, containing only estrogen isn’t how modern combined pills are formulated, and whether or not there are placebo days doesn’t define monophasic.