Levonorgestrel BP — what it is and how to use it

Levonorgestrel BP is a version of levonorgestrel made to BP (British Pharmacopoeia) standards. That means the product meets set quality rules for purity and strength. You probably know levonorgestrel from emergency contraception (Plan B) and from hormonal IUDs or implants. This page gives straight facts: when it works, how to take it, common side effects, and practical buying and storage tips.

How to take levonorgestrel (emergency use)

For emergency contraception, the usual single dose is 1.5 mg of levonorgestrel, or two 0.75 mg tablets taken 12 hours apart. Take it as soon as possible after unprotected sex. It works best within 72 hours and becomes less effective the longer you wait. If you are over about 70 kg (154 lb) or have a high BMI, levonorgestrel may be less reliable — consider a copper IUD or a medical consult for alternatives.

Levonorgestrel won’t stop an existing pregnancy. It’s not an abortion pill. If you are already pregnant, it won’t harm the pregnancy, but it won’t end it either. If you vomit within two hours of taking the tablet, contact a healthcare professional — you may need to repeat the dose.

Side effects, interactions, and practical tips

Common side effects are mild and short-lived: nausea, tiredness, dizziness, breast tenderness, and light spotting or changes to your next period. If your next period is more than a week late after using levonorgestrel, get a pregnancy test.

Certain medicines can reduce levonorgestrel’s effectiveness. These include enzyme inducers like rifampicin, rifabutin, some anti-seizure drugs (carbamazepine, phenytoin), and St. John’s wort. If you’re on any of these, talk to a clinician about other emergency options.

Storage is simple: keep tablets in a cool, dry place away from direct sunlight. BP-labeled products should include storage instructions on the pack. Check expiry dates and packaging for tampering before use.

Buying tips: levonorgestrel is over-the-counter in many countries, and you can also buy it online. Buy from reputable pharmacies, check that the product meets recognized standards (BP, USP, or equivalent), and avoid suspiciously low prices or vendors with poor reviews. If in doubt, call a pharmacist.

Backup contraception matters. After taking levonorgestrel, start or resume regular birth control as advised by your provider. If you use hormonal methods, early use of levonorgestrel can affect the timing of your next pill or implant schedule — ask for clear instructions.

If you need maximum protection, a copper IUD inserted within five days after unprotected sex is the most effective emergency option and also provides ongoing contraception. Talk to your clinician right away if you want this option.

Want help choosing the right option? Reach out to a pharmacist or clinician. They can check interactions, timing, and whether a copper IUD makes more sense for you. Quick action matters, so don’t wait.