Plan B pill size and key specs at a glance
The standard Plan B (levonorgestrel) single-dose pill is a small white tablet about 18–20 mm in diameter and roughly 4 mm thick, similar in size to a small multivitamin. It typically weighs close to 1 gram. The 1.5 mg single-tablet regimen is supplied in a compact foil pouch; the two-tablelet 0.75 mg regimen uses slightly larger packaging but the tablets themselves are comparable. The pill is round, beveled-edge, and imprinted with a product identifier. For precise identification, refer to the imprint and packaging rather than visual comparison alone. Below we break down dimensions, weight, and how these attributes fit into correct use and safety.
What is Plan B and how is it supplied?
Plan B is an over-the-counter emergency contraceptive designed to reduce the risk of pregnancy after unprotected intercourse or contraceptive failure. It contains levonorgestrel, a progestin that primarily work by delaying or inhibiting ovulation. The product is available without a prescription in many regions and is intended as a backup option, not a regular form of contraception. Understanding its physical characteristics can help you confirm you are using the correct product and appropriate dose.
Two regimens, one active ingredient
There are two common Plan B regimens: a single 1.5 mg tablet or two 0.75 mg tablets taken about 12 hours apart. Both deliver the same total levonorgestrel dose but differ in dosing schedule. The single-tablet product is often supplied in a small, flat, round container; the two-tablet version may come in a slightly larger package with two compartments or blister cards. The tablets themselves are similar in size and shape, which underscores the importance of checking the package labeling to confirm which regimen you have and how to take it.
Physical dimensions and weight
Manufacturers do not always publish precise tolerances, but product labeling and standard references indicate Plan B tablets are generally about 18–20 mm in diameter and approximately 4 mm thick. Weight is close to 1 gram per tablet, though exact figures are not typically provided on consumer packaging. These dimensions are comparable to other commonly swallowed tablets and capsules. When in doubt, consult the imprint, packaging, and, if necessary, a pharmacist or reliable medical resource for confirmation.
Size comparison and identification tips
- Diameter: roughly 18–20 mm, similar to a small button or a standard multivitamin.
- Thickness: about 4 mm, making it slightly thicker than a standard paperclip head.
- Weight: close to 1 gram; not usually printed on consumer packs, but consistent with levonorgestrel 1.5 mg or 0.75 mg tablet norms.
- Appearance: small, round, white, beveled-edge tablet with product imprinting.
Practical considerations for use
Because Plan B is taken as soon as possible after unprotected sex or contraceptive failure, knowing its size can help you handle and track the pills correctly. The single 1.5 mg tablet is taken whole once; the two-tablet regimen involves taking one tablet now and one 12 hours later. If you are unsure which product you have, verify the packaging, check the imprint, and follow the dosing instructions that correspond to that specific product. Incorrect dosing reduces effectiveness and can increase the risk of confusion about when you took each dose.
Effectiveness, timing, and what influences results
Plan B is most effective when taken as early as possible after unprotected intercourse; efficacy decreases with time. It is designed primarily to delay ovulation and is less effective if ovulation has already occurred. Body weight and BMI can influence how well levonorgestrel works, with reduced effectiveness observed at higher weights. If you are concerned about weight-related reduced efficacy or have questions about interactions with other medications, consult a healthcare provider or pharmacist for tailored guidance.
Safety, side effects, and when to seek care
Plan B is generally safe for most people when used as directed. Common side effects include nausea, abdominal pain, fatigue, headache, and irregular bleeding. These are usually mild and short-lived. If you experience severe symptoms or suspect you are pregnant, contact a healthcare professional. Plan B does not protect against sexually transmitted infections and is not intended for ongoing contraception; consider discussing longer-acting, reliable methods with your provider if you need regular birth control.
Verification and sources
Information on Plan B pill size and physical attributes is derived from product labeling, FDA-approved medication guides, and standard pharmaceutical references. These sources describe tablet dimensions, appearance, and dosing regimens but may not list exact weight measurements on consumer packaging. The table below summarizes the most relevant verified attributes.
Verified product attributes for Plan B (levonorgestrel emergency contraception)
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Active ingredient | Levonorgestrel 1.5 mg (single tablet) or 0.75 mg (each of two tablets) | Product labeling / FDA drug label |
| Tablet size (diameter) | Approximately 18–20 mm | Manufacturer specifications / standard references |
| Tablet thickness | Approximately 4 mm | Manufacturer specifications / standard references |
| Regimens available | Single 1.5 mg tablet; or two 0.75 mg tablets taken 12 hours apart | Product labeling / FDA drug label |
| Packaging | Foil pouch or dual-compartment package with imprinted identifiers | Commercial packaging and labeling |
Additional notes and delivery considerations
Plan B is available at many pharmacies, supermarkets, and online retailers, often without age restrictions in regions where it is sold over the counter. Delivery options vary; local pickup or home delivery can affect how quickly you can use the medication after an emergency. Because effectiveness declines over time, prioritize timely access and follow the instructions that correspond to the specific product you receive. When in doubt, seek guidance from a pharmacist, clinician, or sexual health resource.
Bottom line
Plan B is a small, white, round tablet approximately 18–20 mm in diameter and about 4 mm thick, with each tablet weighing close to 1 gram. It is supplied in compact packaging for either a single 1.5 mg dose or a two-tablet 0.75 mg regimen. Knowing the physical characteristics can aid identification and handling, but always rely on package imprint and labeling for correct use. For safety and effectiveness, take it as directed and as early as possible, and consult a healthcare provider if you have concerns about dosing, interactions, or ongoing contraception needs.