Prescription Medications
Yes, your periods can be affected by the dosage of your medication, even if you are using it correctly. You might notice changes in your cycle shortly after starting a new prescription, especially if you are being treated for autoimmune diseases like lupus or have a thyroid condition. The reason for this is the way drugs affect hormones. Any time medications imbalance your hormones, your cycle has a chance of becoming irregular.
Similarly, birth control can also affect your period. Most birth control will manipulate your cycle, so you might not get your period on the days you would without the medication. For instance, if you are using pills, rings, or patches, you will be on a 28-day cycle, since these medications force the body into that rhythm.
