Depends on what is the half life and what the dose is....we're not really talking about doubling it anyway because she threw it up...it's just a question of whether doubling will hurt you so you know just in case she absorbed some. I know her current haldol dose is on the low side as she was taking 5mg pills before and now only 2mg so that would be a max of 4mg in a single dose even if she absorbed it....not going to hurt her....obviously better to consult a pharmacist or pdoc than me but if I were in that situation I would take it....the ADs eh you can get some toxicity with those so I wasn't really sure that why I asked what it was.