I trust this situation may have already resolved itself, but if you're ever in doubt about questions like the one above, Samm, keep this number/link within easy reach. Poison control centers deal with household poisons but also with tons of drug-related questions. They're very good about calculating potentially harmful or lethal dosages. If you ever encounter such an occurrence again, it's generally a good idea not to stop and ask questions but to go ahead and err on the side of caution and go to the nearest ER or call a doctor or a nurse practitioner.
http://www.1-800-222-1222.info/FAQs/home.asp