Generic Name: PROGESTIN/ESTROGEN CONTRACEPTIVE - ORAL
Pronounced: (proe-JES-tin/ES-troe-jen)

Levlen (28) Oral Interactions

The effects of some drugs can change if you take other drugs or herbal products at the same time. This can increase your risk for serious side effects or may cause your medications not to work correctly. These drug interactions are possible, but do not always occur. Your doctor or pharmacist can often prevent or manage interactions by changing how you use your medications or by close monitoring.

To help your doctor and pharmacist give you the best care, be sure to tell your doctor and pharmacist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products) before starting treatment with this product. While using this product, do not start, stop, or change the dosage of any other medicines you are using without your doctor's approval.

Some products that may interact with this drug include:

• aromatase inhibitors (e.g., anastrazole, exemestane)
• raloxifene
• sodium tetradecyl sulfate
• tamoxifen
• medication for underactive thyroid (hypothyroidism)
• drugs that may increase blood levels of this drug (e.g., acetaminophen, ascorbic acid/vitamin C, atorvastatin, azole antifungals such as itraconazole/ketoconazole/vaginal miconazole)

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 drug can speed up or slow down the removal of other drugs from your body by affecting certain liver enzymes. These affected drugs include acetaminophen, aspirin, certain beta blockers (e.g., metoprolol), clofibrate, cyclosporine, morphine, corticosteroids such as prednisolone, certain benzodiazepines such as lorazepam/temazepam, and theophylline, among others. If you are currently using any of these medications listed above, tell your doctor or pharmacist before starting this medication.

This medication can affect the results of certain lab tests (e.g., blood tests for clotting factors, thyroid). Make sure laboratory personnel and all your doctors know you use this medication.

This document does not contain all possible drug interactions. Keep a list of all the products you use. Share this list with your doctor and pharmacist to lessen your risk for serious medication problems.

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