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.
If you're not sure if your morning after pill package is complete, contact your pharmacist for advice specific to your situation. one, just follow the instructions, Take 1 1.50 MCG or 2 .75 MCG. 2 if that is how many there is in the package or 1 if it is plan b onestep. You only take one dose, be that the one- or two- pill dose, as soon as possible after unprotected sex. The number of times you had sex doesn't affect how many pills you take. If you're not sure how many pills should be in the brand of the morning after pill that you have, contact your health care provider or pharmacist for advice specific to your situation.