How is Progestin Contraceptives dosed?
Progestin contraceptives come in oral and parenteral (injection) routes. The dosing for these routes depends on the specific medication and the medical condition being treated.
For levonorgestrel, used for emergency contraception, the recommended oral dosage is:
- Adults and teenagers: 0.75 mg taken as soon as possible within 72 hours of intercourse, followed by a second dose 12 hours later.
For medroxyprogesterone, used for preventing pregnancy, the recommended injection dosage is:
- Adults and teenagers: 150 mg injected into a muscle in the upper arm or buttocks every 13 weeks.
For medroxyprogesterone in subcutaneous injection form, the recommended dosage is:
- Adults and teenagers: 104 mg injected under the skin of the anterior thigh or abdomen every 12 to 14 weeks.
For norethindrone, also used for preventing pregnancy, the recommended oral dosage is:
- Adults and teenagers: The specific dosage and regimen depend on the medical condition and doctor's prescription. Note that these dosages are general guidelines and may vary based on individual factors. It is important to follow your doctor's prescription and instructions for dosing to ensure the best outcome and minimize side effects.
What is the dosage form of Progestin Contraceptives?
Progestin contraceptives are available in several dosage forms for oral and parenteral routes of administration. For oral dosage forms:
- Levonorgestrel: This is used for emergency contraception and is available in tablet form. The recommended dosage for emergency contraception is 0.75mg taken as soon as possible within 72 hours of intercourse, followed by a second dose 12 hours later.
- Norethindrone: This is also available in tablet form for preventing pregnancy. The recommended dosage is 0.35mg taken every 24 hours, starting on the first day of the menstrual cycle.
- Norgestrel: This is available in tablet form for preventing pregnancy, with a recommended dosage of 75 micrograms taken every 24 hours, starting on the first day of the menstrual cycle. For parenteral dosage forms:
- Medroxyprogesterone: This is available in muscular injection dosage form for preventing pregnancy, with a recommended dosage of 150mg injected into a muscle in the upper arm or buttocks every three months (13 weeks).
- Norethindrone: This is also available in subcutaneous injection dosage form for preventing pregnancy. The recommended dosage is 104mg injected under the skin of the anterior thigh or abdomen every three months (12 to 14 weeks). Please consult your doctor for personalized advice on dosage and usage, as these instructions are for general guidance only.
What medications are contraindication with Progestin Contraceptives?
It is important to use a second method of birth control with progestin contraceptives when taking medications that may reduce their effectiveness. The following medications may interact with progestin contraceptives:
- Aminoglutethimide (e.g., Cytadren)
- Carbamazepine (e.g., Tegreto)
- Phenobarbital
- Phenytoin (e.g., Dilantin)
- Rifabutin (e.g., Mycobutin)
- Rifampin (e.g., Rifadin)
Please consult your doctor for specific advice on contraindications and interactions, as the provided list may not be exhaustive or up-to-date.
How is Progestin Contraceptives administered?
Progestin contraceptives can be administered through both oral and parenteral routes. The oral route involves taking tablets or pills, while the parenteral route includes injections or implants. The specific administration method depends on the type of progestin contraceptive being used and the individual's preference or medical advice. It is important to follow the dosage instructions provided by your healthcare professional and adhere to the prescribed schedule to ensure the medication works effectively and minimize side effects.
What are common precautions when taking Progestin Contraceptives?
Common precautions when taking progestin contraceptives via oral or parenteral routes include:
- Regular check-ups: It is important to have regular visits with your healthcare professional to adjust your dosage and monitor any unwanted effects. For oral progestin contraceptives, these visits are usually every 12 months.
- Consistent dosing: Taking the medication at the same time each day helps reduce side effects and ensures its effectiveness. For oral progestin contraceptives, take a tablet every 24 hours, preferably at the same time each day.
- Proper storage: Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
- Missed doses: If you miss a dose, take it as soon as you remember. However, if it's been more than 3 hours since the missed dose, skip it and continue with your regular dosing schedule.
- Drug interactions: Inform your doctor of all medications you are taking, as certain combinations may require dose adjustments or additional precautions.
- Pregnancy testing: If you miss a menstrual period within 45 days after a missed or delayed dose, consult your doctor for a pregnancy test.
- Switching from other contraceptives: When switching from estrogen and progestin oral contraceptives, take the first dose of the progestin-only contraceptive the next day after the last active pill of the estrogen and progestin oral contraceptive has been taken. Use a second method of birth control for at least the first 3 weeks to ensure full protection.
- Injection scheduling: Follow your doctor's orders to schedule proper timing for receiving an injection of progestins for contraception. Remember to adhere to your doctor's instructions and consult them if you have any concerns or questions about your contraceptive use.