Mast cells. Mast cells and basophils are generally thought to be the major sources of histamine and can themselves be modulated by histamine as they express H 1, H 2 and H 4 receptors, although how this varies between different mast-cell types is not yet clear.
3. The pill is to be taken soon after unprotected sex. It should be taken preferably within 24 hours and before 72 hours or else the pill may turn useless. 4. I-pill checks pregnancy by preventing ovulation or fertilisation or implantation of the fertilised egg. 5. I-pill is 95 per cent effective if taken in time.
This is because consuming the wrong dosage may have serious side effects, and it can be extremely harmful to your body. The correct dosage is to have one tablet of plan b as soon as possible after you had the unprotected sex. The time duration is to consume it within the 72 hours after unprotected intercourse.