Contingency One - Uses, Side Effects, Interactions - (2023)

How does this medicine work? What will that do for me?

Levonorgestrel belongs to the family of medicines known asprogestins. Progestogens are female sex hormones used in birth control pills, often in combination with the hormone estrogen.

Levonorgestrel is a progestogen-only rescue contraceptive pill designed to be used within 72 hours of unprotected intercourse.It should only be used by women whose regular birth control methods have failed or who may have had sex without birth control. It is not a substitute for the correct use of regular contraception.

This drug is believed to prevent pregnancy primarily by delaying ovulation or preventing the egg from being fertilized. It can also prevent egg implantation by changing theendometrium(inner lining of the uterus). It is important to note that once a pregnancy is implanted and established, levonorgestrel cannot cause a miscarriage or harm an unborn baby. Serious complications have not been reported with this medication.

This drug reduces the risk of pregnancy in users from about 8% to about 1% after unprotected intercourse.It is most effective in the first 24 hours after intercourse.

It should be noted that this medication does not protect against HIV infection (AIDS) or any other sexually transmitted infection.

Your doctor may have recommended this medication for conditions other than those listed in these drug information articles.Also, some forms of this medication may not be used for all conditions discussed here. If you have not discussed this with your doctor or are not sure why you are taking this medicine, talk to your doctor.Do not stop taking this medication without consulting your doctor.

Do not give this medicine to other people, even if they have the same symptoms as you.It can be harmful for people to take this medication unless their doctor has prescribed it.

In what form does this medicine come?

Each round, white to off-white, uncoated, flat tablet, engraved with “251” on one side, contains 1.5 mg of levonorgestrel.Non-medicinal ingredients:colloidal silicon dioxide, corn starch, lactose monohydrate, magnesium stearate and polyvinylpyrrolidone K-25.

How should I use this medicine?

The 1.5 mg tablet included in the kit should be taken as soon as possible within 72 hours of unprotected intercourse.The medication is most effective when taken within 12 to 24 hours of unprotected intercourse.

Since this medication is often associated with nausea, your doctor may want you to take medication to prevent nausea at the same time that you take these pills. If you vomit within 2 hours of taking the tablet, you should contact your doctor as you may need to take another dose. This medication can be used any time during the menstrual cycle. It can be taken with or without food. Taking it with food can help reduce nausea.

Most women have their expected period within 7 days of their normal period after using this medication.If you don't get your period within 7 days of the scheduled time,you must take a pregnancy test.

Many things can affect the dose of medication a person needs, such as: B. body weight, other illnesses, and other medications.If your doctor has recommended a dose other than those listed here,Do not change the way you take your medicine without consulting your doctor.

It is important to take this medication exactly as directed by your doctor. Levonorgestrel is not intended for routine contraceptive use.

Do not dispose of any medication down the drain (eg sink or toilet) or household waste. Ask your pharmacist how to dispose of medicines that you no longer need or that have expired.

Who should NOT take this medicine?

Do not take this medication if you:

  • are allergic to levonorgestrel or any of the other ingredients of this medicine
  • is or may be pregnant
  • have undiagnosed abnormal vaginal bleeding

What side effects are possible with this medication?

Many medications can have side effects.A side effect is an unwanted reaction to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent.

The side effects listed below do not occur in everyone who takes this medication.If you are concerned about side effects, discuss the risks and benefits of this medication with your doctor.

The following side effects have been reported by at least 1% of people taking this medication. Many of these side effects can be treated, and some may go away on their own over time.

Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist can advise you on how to manage side effects.

  • stomachache
  • mastalgia
  • Diarrhea
  • dizziness
  • fatigue
  • Headache
  • irregular, changed, or heavier menstrual bleeding
  • migraine
  • nausea
  • To vomit

While most of the side effects listed below don't happen very often, they can cause serious problems if you don't see a doctor.

Contact your doctor as soon as possible if you experience any of the following side effects:

  • Cramps or severe abdominal pain before your next regular period
  • itch
  • painful menstruation
  • acne
  • vaginal discharge
  • very heavy vaginal bleeding

Some people may experience side effects other than those listed.Contact your doctor if you experience any symptoms that worry you while using this medicine.

Are there any other precautions or warnings for this medication?

Before starting any medication, tell your doctor about any medical conditions or allergies you may have, any medications you are taking, if you are pregnant or nursing, and any other important information about your health. These factors may affect how you should use this medication.

Reduced efficiency:This medication may be less effective in women weighing more than 75 kg. Regardless of body weight, this medication should be taken as soon as possible after unprotected intercourse to ensure the most reliable result possible. If you weigh more than 165 pounds, you should contact your doctor or pharmacist for emergency contraception advice.

Diabetes:Although few women have lost blood sugar control when taking progestogen pills, women with diabetes should carefully monitor their blood sugar after taking this medication.

liver problems:The safety of this medication for use in people with liver disease has not been established. If you have liver disease, talk to your doctor if you need special monitoring.

Migraine:Severe headaches or migraines may occur after taking a dose of levonorgestrel.

sexually transmitted infections:This medication does not protect against sexually transmitted infections, including HIV or AIDS. Latex condoms should be used to protect against these infections.

The pregnancy:This medicine should not be used during pregnancy. An established pregnancy will not be terminated.

breast-feeding:Small amounts of progestogen pass into the breast milk of women taking progestogen-only pills. No side effects were identified from taking this medication during breastfeeding, either in terms of the quality and quantity of milk, or in terms of the baby's growth and development.

What other drugs can interact with this medicine?

There may be an interaction between levonorgestrel and any of the following medications:

  • acitretina
  • Antibiotika (Ampicillin, Cotrimoxazole, Tetracycline, Clarithromycin)
  • they will have been
  • aprepitanto
  • Barbitúrico (z. B. Pentobarbital, Phenobarbital)
  • bosentan
  • carbamazepine
  • cholestyramine
  • colestipol
  • clobazam
  • Cobicistate
  • cyclosporine
  • dabigatran
  • dabrafenibe
  • darunavir
  • deferasirox
  • Diabetesmedikamente (z. B. Canagliflozin, Glyburid, Insulin, Metformin, Rosiglitazon)
  • more or less
  • Efavirenz
  • eslicarbazepina
  • exenatida
  • fosaprepitanto
  • Fosphenytoin
  • heparin
  • HIV protease inhibitor (with B. Atazanavir, Indinavir, Ritonavir, Saquinavir)
  • isotretinoin
  • lamotrigine
  • low molecular weight heparins (eg dalteparin, enoxaparin, tinzaparin)
  • lumacaftor and ivacaftor
  • mifepristona
  • modafinil
  • mycophenolate
  • nevirapina
  • octreotida
  • Oxcarbazepina
  • perampanel
  • phenytoin
  • time
  • rifampicin
  • rifabutin
  • rivaroxabana
  • juan herbs
  • Selfish
  • selegilina
  • siltuximabe
  • thalidomide
  • tocilizumab
  • topiramate
  • tranexamic acid
  • triazolam
  • tretinoin
  • ulipristal
  • voriconazol
  • warfarin

Since only one levonorgestrel tablet is taken, the effects of these drugs on how levonorgestrel works are likely to be minimal.If you are taking any of these medicines, talk to your doctor or pharmacist.Depending on your specific circumstances, your doctor may want you to:

  • stop taking any of the medications
  • Swap one of the drugs for another,
  • Change the way you take one or both of your medicines, or
  • leave everything as it is.

A drug interaction doesn't always mean you should discontinue one.Talk with your doctor about how drug interactions are managed or should be treated.

Medications other than those listed above may interact with this medication.Tell your doctor or prescriber about all prescription, over-the-counter (without a prescription), and herbal medicines you are taking. Also let them know about any supplements you are taking. Because caffeine, decongestants, alcohol, nicotine from cigarettes, or illicit drugs can interfere with the effects of many medications, you should tell your doctor if you are taking them.

All materials are copyright of MediResource Inc. 1996 – 2023.General contracting conditions. The content included here is for informational purposes only. Always consult your physician or other qualified health care provider if you have concerns about any medical condition.


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