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Previfem
Previfem is a combination oral contraceptive that contains two hormones: ethinyl estradiol (an estrogen) and norgestimate (a progestin). It is primarily used for the prevention of pregnancy and can also regulate menstrual cycles, reduce menstrual cramps, and improve acne in some users. Previfem works by inhibiting ovulation, thickening cervical mucus to prevent sperm from reaching an egg, and altering the uterine lining to prevent implantation.
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Frequently Asked Questions
How effective is Previfem at preventing pregnancy?
When taken correctly, Previfem is over 99% effective in preventing pregnancy.
What should I do if I miss a dose of Previfem?
If you miss a dose, take it as soon as you remember. If it's almost time for your next dose, skip the missed dose and continue with your regular schedule. Follow the specific guidelines provided by your healthcare provider for missed doses.
Are there any specific dietary restrictions while taking Previfem?
There are no specific dietary restrictions, but maintaining a balanced diet can support overall health.
Can I take Previfem while breastfeeding?
Consult your healthcare provider before using Previfem while breastfeeding, as it may affect milk production and transfer to the infant.
Is it safe to use Previfem long-term?
Many women use Previfem safely for several years. Regular check-ups with your healthcare provider are important to monitor health and address any concerns.
Comprehensive Drug Guide
How Does Previfem Work?
- Inhibiting Ovulation: Suppressing the release of eggs from the ovaries.
- Thickening Cervical Mucus: Making it more difficult for sperm to enter the uterus.
- Altering the Uterine Lining: Making it less suitable for a fertilized egg to implant.
Common Dosages
- Tablets: 0.035 mg of ethinyl estradiol and 0.25 mg of norgestimate.
Typical Dosing
- The recommended dose for Previfem is one tablet taken orally once daily at the same time each day. It is advised to start taking the tablets at least 7 days before engaging in sexual intercourse for optimal contraceptive effectiveness.
Typical Dosing
FDA Approved Indications
- Prevention of pregnancy in women of reproductive age.
Who Shouldn't Take Previfem?
- Known hypersensitivity to ethinyl estradiol, norgestimate, or any of the components of the formulation
- History of thromboembolic disorders (e.g., deep vein thrombosis or pulmonary embolism)
- Certain cancers (e.g., breast cancer or estrogen-sensitive cancer)
- Severe liver disease or liver tumors
- Uncontrolled hypertension
Advice From The Pharmacist
- Take Previfem exactly as prescribed, and do not skip doses to ensure maximum effectiveness in preventing pregnancy.
- Inform your healthcare provider about any other medications you are taking, as some medications can interact with hormonal contraceptives.
- Monitor for any side effects, and report significant changes or concerns to your healthcare provider promptly.
Side Effects of Previfem
Common Side Effects
- Nausea
- Headache
- Breast tenderness
- Weight gain
- Mood changes
Uncommon/Severe Side Effects
- Blood clots (thromboembolism)
- Stroke
- Heart attack
- Severe allergic reactions
Risks and Warnings of Previfem
- Thromboembolic Events: There is an increased risk of blood clots in women who smoke, are over 35, or have other risk factors.
- Monitoring: Regular check-ups are advised to monitor blood pressure and assess any potential side effects.
- Cancer Risks: Some studies suggest a slight increase in the risk of breast and cervical cancer in women using combination hormonal contraceptives.
Interactions with Previfem
Common Drug Interactions
- Antibiotics: Some antibiotics may reduce the effectiveness of Previfem, although most do not.
- Anticonvulsants: Medications used for seizure control may affect the efficacy of hormonal contraceptives.
- Herbal Supplements: St. John's Wort and other herbal products may decrease the effectiveness of birth control pills.
Alternatives to Previfem
- Other Combination Oral Contraceptives: Various formulations are available with different hormone combinations or dosages.
- Progestin-Only Pills: Suitable for women who cannot take estrogen.
- Long-Acting Reversible Contraceptives (LARCs): Such as IUDs or implants for long-term contraception.
