Can strep throat medication cause late period? i've been having a ton of acne and have been tired lately (not sure if that has anything to do with it

Not meds, but....: Your being I'll is more likely to have altered your cycle than the medication . The stress of illness on your body can affect hormone levels and thus your period. Remember, though, antibiotics can affect how well your contraception works, so use extra protection if you don't want to get pregnant and are on an type of contraception