Contraceptive methods involving the administration of
chemical substances are widely practiced among women who
desire to limit pregnancies. Such methods control fertility
through various biological mechanisms. Among the presently
used chemical methods of fertility control, the most
important
are those which act by means of the following: (a) suppression
of ovulation through inhibition of gonadotropin release; (b)
alteration of the female reproductive tract to prevent
migration of sperm to the site of fertilization or, if
fertilization occurs, to block implantation of the zygote (nidation);
or (c) spermicidal action.
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