The liability depends on the facts of your case and when the error took place. Your doctor should not write you an incorrect prescription. Your pharmacist also has a responsibility to dispense the proper dosage of your medication, and they must also know the properties and side effects of the medications they sell. Assigning blame can become confusing, if you think you may have a defective drug case or want to speak with an attorney, you can click here or call 877-273-6823. The consultation is free and there is no obligation to call.