How Effective Is Plan B If You Take Within A Day?
Birth Control

How Effective Is Plan B If You Take Within A Day?

It is never too late to take a medicine when you are in a doubt of becoming pregnant. Chances of working successfully would be a situation you might think off, know it first.

May 23, 2022

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Post Highlights

Plan B, also known as the morning-after pill, is an oral emergency contraceptive pill that helps to prevent unwanted pregnancy after unprotected sex. It is an over-the-counter (O.T.C.) contraceptive approved by the F.D.A.

It consists of a single active ingredient, Levonorgestrel 1.5 mg, a steroid hormone, which has a function similar to progesterone (i.e. regulation of menstrual cycle)

This pill prevents pregnancy by delaying or stopping the ovulation cycle and is recommended to take sooner after sexual intercourse for its better efficacy.

How Does It Work?

Plan B can work in the following ways-

  1. Stops the release of an egg from the ovaries
  2. It stops a fertilized egg from implantation in the uterus.

However, if implantation has already taken place before the administration of Plan B, this pill does not work.

How Should You Use Plan B?

This pill should be consumed with a glass full of water 3 days after having unprotected sex. It should be taken with meals and not on an empty stomach.

However, it is advised to read all instructions mentioned on the product package or in the leaflet before self-medicating this pill or taking it as recommended by the doctor.

Where Can You Get Plan B?

Plan B is an O.T.C. drug, readily available without prescription for all people, regardless of age.

It can be taken from an online provider, any local pharmacy, or health department clinics.

Is The Morning Pill Effective?

Plan B is a well-known contraceptive to avoid pregnancy. It shows the highest efficacy if taken within 72 hours after the sexual intercourse, i.e. it reduces the risk of pregnancy by 75-89%.

What Factors Can Affect The Efficacy Of Plan B?

Plan B might show less effectiveness in women near the ovulation stage or with a more significant body mass index (B.M.I.).

Breastfeeding women can use plan B without any adverse effects.
Plan B emergency contraceptive is ineffective against sexually transmitted diseases (STDs).
Plan B can be taken even after 72 hours, but these pills are comparatively less effective after this period.
Yes, there are chances to get pregnant even after taking Plan B. If you take Plan B after unprotected intercourse and then have sex again, you'll need to take another pill.

How Long Is Plan B Effective?

Plan B contraceptive pill is most effective if taken within the first 3 days after having unprotected sex. Once administered, this pill is effective for a maximum of 5 days, after which the hormone (progestin) within the pill is eliminated from the body.

The maximum time that hormone remains inside the body coincides with the period that sperm can stay within the female reproductive system, i.e. nearly five to six days.   

Dosage For Plan B

Take one Plan B tablet as soon as possible within 3 days after having unprotected intercourse. Its second dose should be taken 12 hours after the first dose. 

Plan B can be used at any time during the menstrual cycle.

Side Effects Of Using Plan B

Plan B is regarded as safe medication; however, it can cause some side effects in some people, which includes-

  1. Heavy menstrual bleeding
  2. Vomiting
  3. Dizziness, fatigue, headache
  4. Breast tenderness
  5. Vaginal bleeding

Interaction Of Plan B With Other Drugs

Plan B can interact with other medicines, resulting in reduced effectiveness. These include-

  1. Antibiotics (Rifampin, sulpha drugs)
  2. Anticonvulsants (Phenytoin, oxcarbazepine, carbamazepine, topiramate)
  3. HIV drugs (Ritonavir)
  4. Others (Benzodiazepines, Bosentan, Griseofulvin)

Other Alternatives

Some generic versions of an emergency contraceptive are available, which are as effective as Plan B, which includes-

  1. Take Action- It should be taken within 3 days after having intercourse but should not be taken as a regular birth control pill or when already pregnant. Side effects include tiredness, menstrual changes, breast pain
  2.  My Way- This should also be taken as soon as possible after engaging in sexual activity. Women with severe abdominal pain should avoid taking this pill due to the chances of ectopic pregnancy
  3. Next choice is one-dose- It should be taken within 3 days after the sexual activity.

This pill is not adequate for a person weighing more than 160 lb.

Final Words From Druggist

Plan B, A.K.A. morning after, is an oral emergency contraceptive pill that prevents pregnancy after unprotected sexual activity by delaying or stopping ovulation. This pill does not work if pregnancy has already occurred or in case of sexually transmitted diseases and does not bring about abortion. This pill is safe to use and is most effective if taken sooner after sexual intercourse.


Heartburn hurts if not treated properly

We help you to treat your heart burns with medication.