When you're seriously ill or recently injured, you seek expert medical attention. You do so under the assumption that the care you're receiving will help mitigate and address your medical issues, not cause new ones. Sometimes, unfortunately, mistakes happen in a medical setting with dire consequences. Although it doesn't happen that often, it is possible for a nurse or other professional in the hospital to give you a medication that you shouldn't be receiving. Most times, when it happens, the reaction to the drug is minor. In some cases, however, there could be an allergy or a drug interaction that results.