which ones are they? Im sure they will be ok.
The drug companies cant test drugs' safety on preg women becuase of the ethical issues. So in theory, no drugs are licensed for use when you're pregnant. They cover their arses by saying 'not for use when preg'
Buuut ... in practice there are drugs that have been tried on animals and if proven safe there, here and there on humans over time and its built up until thousands, sometimes tens of thousands of women have taken these drugs. They record what, if any, problems have happened. If there are no bad effects, if if the babies are born fine with no more chance of something being wrong than normal, they are considered as OK.
The common drugs - cyclazine, B6, metoclopramide, etc have been used a long time and are considered ok. They weren't sure about ondansetron at first, they thought that there might be a slightly increased chance of cleft palate. But in Feb this year a huge study of 600,000 preg women was published in Denmark. 2,000 of those women took ondansetron and no increased risk was found. So it's considered fairly safe now for the baby as far as birth and any bad effects are concerned.
One proviso: no one exactly knows the long term effects of ondansetron which has been used for about 10 years now. There was a drug given for morning sickness in the Netherlands and they found after 25 years that the children of the mothers who had taken it were sterile. Its one of the reasons they are neurotically scared of giving tablets here. Btw, with the good quality drug trial procedures used now, thalidomide would never have been even tested on humans.
So in theory, no drug is guarenteed safe but some have been used so long and been so good that they are sure there are no ill effects. On the other hand they -do- know that severe dehydration is most certainly bad for mother and baby. You have to weigh up risks and choose the smaller one, which is what the more sensible doctors do. After all, some women end up being forced to consider and go for an abortion becuase of HG and that's the worst of all for the baby.
But becuase there has been no direct testing on preg women of drugs, in theory no drug is licensed for use on them. Its just that well, the common meds have been used for decades with no ill effect on many thousands of women.
So no, don't worry. The drug companies just cover their arses.
... im sure i could have been less longwinded .. !