Just began taking tetralysal, have been prescribed two pills a day, one morning, one night. I have been on the pill, Yaz, for a month, also in concerns to acne, now do i stop taking yaz since i started this tetralysal, or can i continue with taking both...? doctor said taking both is fine, but i read up on tetralysal and saw the contraceptive pill makes the tetralysal effectiveness lessen