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About Plan B
Generic Plan B (Levonorgestrel) is a single-dose emergency contraceptive pill approved for use in Singapore to prevent an unintended pregnancy after unprotected sexual intercourse or contraceptive failure. It contains 1.5 mg of levonorgestrel, a synthetic progestogen that interferes with the hormonal processes required for ovulation, fertilisation, and implantation. While the product is most effective when taken as soon as possible within 72 hours, it can be used up to 120 hours after the event, with a gradual decline in efficacy. This article explores how the medication works, when it is appropriate, practical tips for use, and considerations for safety, all tailored to the Singaporean context.
What is Generic Plan B (Levonorgestrel)?
Generic Plan B (Levonorgestrel) belongs to the class of hormonal emergency contraceptives. It is regulated by the Health Sciences Authority (HSA) in Singapore as a non-prescription (over-the-counter) tablet. The active ingredient, levonorgestrel, mimics the natural hormone progesterone, which prepares the uterine lining for a potential pregnancy. The product is marketed as a single-tablet regimen delivering the full 1.5 mg dose needed for emergency contraception. Because it is a generic version, it offers the same therapeutic benefits as the brand name “Plan B One-Step” while typically being more affordable.
How Plan B Works
Levonorgestrel prevents pregnancy primarily by delaying or inhibiting ovulation. When taken before the LH surge that triggers the release of the egg, it blocks the surge and postpones the release, giving the body more time for the natural hormonal feedback loop to reset. If ovulation has already occurred, levonorgestrel can alter tubal motility and change the cervical mucus, making it harder for sperm to reach the egg. In the rare scenario where fertilisation has happened, levonorgestrel may affect the endometrium, reducing its receptivity to a fertilised egg and thereby preventing implantation. The drug does not terminate an established pregnancy; its action is confined to the pre-implantation phase.
Pharmacokinetically, levonorgestrel is rapidly absorbed, reaching peak plasma concentrations within 2 hours. Its oral bioavailability is about 95 %, and it is metabolised primarily by the liver via CYP3A4, with a half-life of roughly 24 hours. Because the dose is a single, high-potency tablet, most of the drug is eliminated within 72 hours, limiting systemic exposure.
Why Plan B Is Used for Sexual Health
- Pre-emptive protection after unprotected intercourse - The rapid onset of action addresses the immediate risk window before the egg can be fertilised.
- Convenient single-tablet regimen - Unlike earlier regimens that required two doses of .75 mg taken 12 hours apart, Plan B’s 1.5 mg single pill eliminates adherence challenges.
- Accessible without prescription - Over-the-counter availability in Singapore pharmacies and licensed online platforms ensures timely access for individuals who may not have immediate medical appointments.
- Cost-effective alternative to brand versions - The generic formulation retains the same efficacy (≈ 89 % within 24 hours, decreasing to ≈ 75 % by 72 hours) while reducing out-of-pocket expenses.
- Guideline-endorsed first-line option - Both the World Health Organization (WHO) and Singapore’s Ministry of Health list levonorgestrel-based pills as the preferred emergency contraceptive for most women, reserving copper IUDs for cases where levonorgestrel is contraindicated or when the highest efficacy is required.
Off-Label and Investigational Uses of Plan B
Currently, there are no robust peer-reviewed studies supporting routine off-label use of levonorgestrel 1.5 mg for indications beyond emergency contraception. Some small observational reports have explored its role in menstrual cycle manipulation (e.g., delaying menses) or post-coital HIV prevention, but these applications remain investigational and are not endorsed by Singapore’s regulatory authorities. Off-label use should only be considered under the supervision of a qualified healthcare provider.
Is Plan B Right for You?
Plan B is suitable for most individuals with a uterus who are seeking immediate contraception after a contraceptive lapse. It is particularly appropriate for:
- Women with regular menstrual cycles who have missed a barrier method or experienced a condom break.
- Individuals who are not currently using hormonal contraception and need rapid protection.
- Those who prefer an over-the-counter solution rather than a prescription-only method.
Caution is advised for:
- Pregnant women - Levonorgestrel does not affect an established pregnancy.
- Women with severe hepatic impairment - Metabolism may be reduced, though data are limited.
- Individuals with known hypersensitivity to levonorgestrel or any excipients - An allergic reaction could manifest as rash, itching, or swelling.
People with a history of thromboembolic disorders, hormone-sensitive cancers, or uncontrolled diabetes should discuss alternative emergency contraception options with a clinician, as progestogenic activity can, in theory, influence these conditions.
Taking Plan B Effectively
- Timing is critical - Take the tablet as soon as possible after the event. Efficacy drops from ≈ 89 % within 24 hours to≈ 75 % by 72 hours.
- With or without food - Levonorgestrel absorption is not significantly affected by meals, allowing flexibility.
- If vomiting occurs within 2 hours - A repeat dose is recommended, as the medication may not have been fully absorbed.
- Missed dose scenario - Because the regimen is a single tablet, there is no “missed dose” concept; however, if the tablet is delayed beyond 120 hours, its effectiveness is negligible, and a new prescription for a regular contraceptive method should be sought.
- Travel considerations - Keep the tablet in its original packaging, away from extreme temperatures, and ensure you have a copy of any required declaration for customs if bringing it into Singapore.
Understanding Side Effects and How to Manage Them
Most users experience mild and transient side effects, reflecting levonorgestrel’s hormonal activity:
- Nausea and abdominal discomfort - Often resolve within 24 hours. Taking the pill with food or a small snack can lessen stomach upset.
- Headache or dizziness - Hydration and rest are helpful; over-the-counter analgesics (e.g., paracetamol) may be used if needed.
- Fatigue or breast tenderness - Typically short-lived; a supportive bra and adequate sleep can provide comfort.
- Irregular bleeding - Spotting or a delayed period is common; if menstruation does not occur within 3 weeks, a pregnancy test is advised.
Serious adverse events such as severe allergic reactions, chest pain, or persistent high-grade fever are rare. Seek immediate medical attention if any of these occur.
Buying Plan B from Our Online Pharmacy
Choosing a reliable source for emergency contraception ensures both safety and discretion.
Why Choose Our Service?
Our online pharmacy brings fast, confidential access to Plan B, especially for those who may find it difficult to visit a brick-and-mortar pharmacy after hours or who prefer privacy.
Quality & Safety
We partner with licensed international pharmacies that comply with WHO-approved Good Manufacturing Practices, guaranteeing that every tablet meets stringent potency and purity standards.
Pricing & Access
Because we source generic versions, the cost is typically 30 % lower than branded alternatives. Repeat customers enjoy a Lifetime 10 % discount on all reorders, making ongoing access affordable.
Discreet Delivery
Orders are packaged in unmarked, tamper-evident envelopes. Standard delivery arrives within 3 weeks, while express shipping is available in ~7 days, both with trackable, confidential shipment.
Frequently Asked Questions
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How soon after intercourse should I take Plan B? The sooner, the better. Efficacy is highest within the first 24 hours and remains acceptable up to 72 hours, after which it declines sharply.
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Will taking Plan B affect my next menstrual period? It may cause an earlier, later, or heavier bleed, or even a temporary absence of menstruation. This change is usually short-term and not a cause for concern.
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Can I use Plan B if I’m already on hormonal birth control? Yes. Levonorgestrel does not interfere with most combined oral contraceptives, patches, or rings. However, you should continue your regular method as prescribed.
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Is Plan B a form of abortion? No. Levonorgestrel works before an embryo can implant, so it does not terminate an existing pregnancy.
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Do I need a prescription to purchase Plan B online? In Singapore, Plan B is available over the counter, so a prescription is not required for purchase through our platform.
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Can men purchase Plan B for a partner? Absolutely. The medication is intended for anyone with a uterus who needs emergency contraception, and buying for a partner is a common practice.
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What should I do if I vomit shortly after taking the pill? If vomiting occurs within 2 hours, repeat the dose with a fresh tablet. If more than 2 hours have passed, the medication is likely absorbed and no repeat is needed.
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Are there any drug interactions I should be aware of? Certain enzyme-inducing medicines (e.g., rifampicin, some anticonvulsants) may lower levonorgestrel levels, reducing efficacy. Inform your pharmacist or clinician if you are taking such medications.
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How does Plan B compare to the copper IUD for emergency contraception? The copper IUD is the most effective method (> 99 % efficacy) and can be inserted up to 5 days after intercourse, but it requires a clinical procedure. Plan B offers a convenient, medication-based alternative with slightly lower efficacy.
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Can I take another dose of Plan B if I have unprotected sex again? Yes, but it should be taken as a new single dose each time, respecting the 72-hour window for optimal effectiveness. Repeated use is not recommended as a regular contraceptive method.
Glossary
- Levonorgestrel
- A synthetic progestogen that imitates the hormone progesterone, used in both regular contraceptives and emergency contraception to prevent ovulation and alter uterine conditions.
- CYP3A4
- An enzyme in the liver responsible for metabolising many drugs, including levonorgestrel; its activity can influence the drug’s plasma levels.
- Over-the-counter (OTC)
- A classification indicating that a medication can be purchased without a prescription, provided the buyer meets age or other regulatory criteria.
- Endometrium
- The inner lining of the uterus that thickens each cycle to support implantation of a fertilised egg; its receptivity is essential for pregnancy.
- Good Manufacturing Practices (GMP)
- Standards set by regulatory bodies to ensure that pharmaceutical products are consistently produced and controlled according to quality specifications.
Disclaimer
The information provided about Plan B is for general knowledge only. It does not replace professional medical consultation. All treatment decisions, including those regarding off-label use, should be made under the supervision of a qualified healthcare provider. We assume all readers are responsible adults capable of making informed decisions about their health. Our online pharmacy offers access to Plan B for individuals who may have limited availability through traditional pharmacies, prescription-based insurance schemes, or who are seeking affordable generic alternatives. Always consult your doctor before starting, changing, or discontinuing any medication.
