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  2. Stimulation of ovulation during the treatment cycle

The best chance of successful pregnancy is usually obtained when more than one embryo is placed in the uterus at the same time. This is because so many early hyman embryos, normally fertilised, are lost normally or do not develop into a baby. Consequently, one way of overcoming this natural tendency is to put two embryos back at once during IVF. When two or three embryos are put back together the risk of a multiple pregnancy such as twins is not necessarily as great as you might expect, though it is certainly higher than in natural conception.

In order to obtain more than one embryo simultaneously, we obviously need more than one egg. This is why drugs are given to make the ovaries work harder than normally. Drugs such as Humegon, Metrodin, Gonal-F, Pergonal or Puregon are given which commonly result in several eggs being shed at the same time. Occasionally many eggs are obtained simultaneously with these drugs but it is very uncommon for all of them to fertilize and make an embryo. Usually, in a good cycle about 60% of the eggs fertilise properly.

Drugs, either pills or injections to make you ovulate, will normally be given to you a few days after your period, at the start of the treatment cycle. We vary the dose and the length of time these drugs are given, depending on your individual responce. This usually results in the ovaries responding more effectively to the treatment. More eggs seem to be produced, with a higher pregnancy rate in certain cases. The doctor co-ordinating your treatment will explain this fully.

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