Mother Accidently took my Grandmas Meds.. HELP!

Patient: My Mom accidently took my Grandmas medication, the pills she accidently took were Metoprolol and Seroquel. So far since she took it has been over 2 hurs and she been sleeping and I been waking her up every half hour or so to make sure shes breathing. She says her feet been itching her really bad. What should i do?