Did you research the drug? What are the side effects? Honestly, depending on the situation, if the benefits out weighed the side effects, then I would probably try it. I took some pharmacology classes, and you would be surprised at how many pills are created for on thing and used for another...Like heart pills helping prevent hair loss.
Just research, research, research, and make an educated decision.
Here is some info I found online.
Side effects of domperidone:
As with all medications, side effects are possible, and many have been reported with domperidone (textbooks often list any side effect ever reported, but symptoms reported are not necessarily due to the drug a person is taking). There is no such thing as a 100% safe drug. However, our clinical experience has been that side effects in the mother are extremely uncommon, except for increasing milk supply. Some side effects which mothers we have treated have reported (very uncommonly, incidentally):
• headache which disappeared when the dose was reduced (probably the most common side effect)
• abdominal cramps
• dry mouth
• alteration of menstrual periods
The amount that gets into the milk is so tiny that side effects in the baby should not be expected. Mothers have not reported any to us, in many years of use. Certainly the amount the baby gets through the milk is a tiny percentage of what babies would get if being treated for spitting up.