SIDE EFFECTS: Nausea, bloating, headache, changes in appetite, weight gain, tiredness, swelling, acne, hot flashes, breast tenderness, or irritation/pain at the injection site may occur. Vaginal bleeding between periods (spotting) or missed/irregular periods may occur, especially during the first few months of use. If any of these effects persist or worsen, tell your doctor or pharmacist promptly. Your periods may stop completely after you have been receiving this medication for about a year. If this occurs, your periods will normally return after you stop using this medication. If you miss a period and have missed an injection, or if more than 13 weeks pass between injections and you think you might be pregnant, contact your doctor for a pregnancy test. Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if you have any serious side effects, including: mental/mood changes (such as new/worsening depression), changes in sexual interest/ability, swelling of the ankles/feet, bone pain, unusual changes in vaginal bleeding (such as continuous spotting, sudden heavy bleeding), persistent nausea/vomiting, severe stomach/abdominal/pelvic pain, unusual weakness/tiredness, dark urine, yellowing eyes/skin, seizure. This medication may increase your risk of breast cancer. Tell your doctor right away if you have symptoms such as a lump in the breast, nipple discharge. Ask your doctor for more details. This medication may rarely cause serious (sometimes fatal) problems from blood clots (such as deep vein thrombosis, heart attack, pulmonary embolism, stroke). Get medical help right away if you have: shortness of breath/rapid breathing, chest/jaw/left arm pain, unusual sweating, confusion, sudden dizziness/fainting, pain/swelling/warmth in the groin/calf, sudden/severe headaches, slurred speech, weakness on one side of the body, sudden vision changes. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

PRECAUTIONS: Before using medroxyprogesterone, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. Before using this medication, tell your doctor or pharmacist your medical history, especially of: blood clots (for example, in the legs, eyes, lungs), unexplained vaginal bleeding, asthma, abnormal breast exam, personal or family history of cancer (especially breast or cervical cancer), daily use of alcohol/tobacco, depression, diabetes, eating disorder (anorexia), heart problems (such as heart failure, irregular heartbeat, previous heart attack), high blood pressure, kidney disease, liver disease (including tumors), high cholesterol or triglyceride (blood fat) levels, migraine, seizures, stroke or "mini-stroke" (transient ischemic attack), personal/family history of bone disease (such as osteoporosis). Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products). It may take longer for you to become pregnant after you stop using this medication. Consult your doctor. This medication must not be used during pregnancy. If you become pregnant or think you may be pregnant, tell your doctor right away. This drug passes into breast milk. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval. Some drugs may cause hormonal birth control to work less well by decreasing the amount of birth control hormones in your body. This effect can result in pregnancy. Examples include griseofulvin, modafinil, rifamycins (such as rifampin, rifabutin), St. John's wort, drugs used to treat seizures (such as barbiturates, carbamazepine, felbamate, phenytoin, primidone, topiramate), HIV drugs (such as nelfinavir, nevirapine, ritonavir), among others. Tell your doctor when you start any new drug, and discuss if you should use additional reliable birth control. Also tell your doctor if you have any new spotting or breakthrough bleeding, because these may be signs that your birth control is not working well. This medication may interfere with certain laboratory tests (including certain hormone levels, blood tests for clotting factors, thyroid/liver function tests), possibly causing false test results. Make sure laboratory personnel and all your doctors know you are using this medication.

OVERDOSE: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.