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Fact Table
| Fact Table | |
|---|---|
| Formula | C21H28O2 |
| License | FDA approved |
| Bioavailability | ~100% (oral) |
| Legal status | Over-the-counter (OTC) |
| Chemical Name | (17a)-17-Hydroxy-13-ethyl-17-methyl-11,15-dioxo-7,8,9,10,12,14,15,16-octahydrocyclopenta[a]phenanthren-3-one |
| Elimination half-life | ~24 hours |
| Dosage (Strength) | 1.5mg tablet (single-dose) |
| Pregnancy | Not applicable for existing pregnancies; used to prevent pregnancy |
| Brands | Plan B One-Step, Take Action, Aftera |
| Protein binding | ~97.5–99% |
| PubChem CID | 13109 |
| MedlinePlus | a610021 |
| ChEBI | 6445 |
| ATC code | G03AC03 |
| DrugBank | DB00367 |
| KEGG | D00977 |
| Routes of administration | By mouth |
Plan B 1-Step is an OTC emergency contraceptive medication for pregnancy prevention. Morning after pills are to prevent a pregnancy if barrier protection birth control is not used or fails and the woman is not taking an oral contraceptive. It works by temporarily delaying ovulation so that sperm do not meet an egg like they would without the use of emergency contraceptive. Plan B one step birth control must be taken within 72 hours of having unprotected sex. You can buy Plan B One Step OTC here at Canpharm with no prescription required.
Directions
1 single tablet taken orally with water within 72 hours (3 days) of having unprotected sex. Do not exceed 1-tablet dosage regulation under any circumstances.
Ingredients
The active ingredient in Plan B One-Step is Levonorgestrel
Cautions
Let the pharmacist know of any history of liver or kidney problems before purchasing this medication
Medication is only to be used for a single episode of unprotected intercourse, and using a barrier contraception method will be necessary until your next period. Wait 5 days after using emergency contraception medication before any resumption of use with hormonal birth control methods.
Never exceed dosage regulations of 1 tablet at one time, and be aware that this medication is an emergency contraceptive and will not work for month-to-month birth control
Be aware that unprotected sex not only increases the chance of unplanned pregnancy, but also increases your risk for STIs (sexually transmitted infections)
Interactions
Negative drug interactions may occur between Plan B one step and other Rx or OTC medications, including oxcarbazepine, bosentan, carbamazepine, topiramate, griseofulvin, phenytoin, rifampin, felbamate, and St. John's wort. Let your doctor know of all medications you are currently taking before getting a prescription and proceeding to buy Plan B one step online.
Side Effects
Plan B side effects may occur, and some users may experience heavier menstrual bleeding, nausea, lower abdomen pain, fatigue, headache, dizziness, or breast tenderness. If side effects are seen you may want to discontinue use and meet with a doctor again to discuss emergency contraception options and a pharmacist for a lower plan b one step price.
Frequently Asked Questions about Plan B One-Step
How long is Plan B One-Step effective?
Plan B One-Step is most effective when taken within 72 hours (3 days) after unprotected sex. However, it works best within the first 24 hours, reducing the risk of pregnancy by up to 87–95%. Its effectiveness decreases the longer you wait.
How to know if Plan B One-Step worked?
There is no immediate way to tell if Plan B worked. However, signs that it was effective include:
- Getting your next period on time or slightly earlier/later
- Experiencing mild side effects like nausea, fatigue, or spotting
- If your period is more than a week late, take a pregnancy test.
Can I take Plan B One-Step while breastfeeding?
Yes, Plan B is safe to take while breastfeeding. Only a small amount of the hormone levonorgestrel passes into breast milk and is unlikely to harm the baby.
Can Plan B One-Step delay your period?
Yes, Plan B can cause temporary changes to your menstrual cycle. Your period may come earlier or later than expected, and flow may be lighter or heavier than usual.
Does Plan B One-Step expire?
Yes, Plan B has an expiration date (usually 3–4 years after manufacturing). Using it after expiration may reduce its effectiveness, so check the package before taking it.
How long does Plan B One-Step last in your system?
Plan B remains in the body for a few days, but its effects on ovulation and hormones may last for a full menstrual cycle.
How often can you take Plan B One-Step?
You can take Plan B multiple times, but it should not be used as regular birth control. Frequent use may cause irregular periods, hormonal imbalance, and side effects like nausea or fatigue.
Does Plan B work if you are overweight?
Plan B may be less effective in people who weigh over 165 lbs (75 kg). Ella (a different emergency contraceptive) or a copper IUD may be better options for individuals in this weight range.
Can Plan B cause cramps?
Yes, Plan B can cause cramping similar to menstrual cramps. This is a common side effect as your body reacts to the hormone changes.
Can you take Plan B and birth control pills together?
Yes, you can take Plan B while on birth control. However, if you missed pills before taking Plan B, continue your regular birth control but use backup contraception (like condoms) for 7 days.
