Should you notify your doctor when the pharmacy substituted metorprolol tartrate for succinate?

Yes, you should notify your doctor immediately if the pharmacy substituted metoprolol tartrate for succinate. Although these two medications are from the same class, they are different salts of metoprolol. They are not directly interchangeable, as the dosages may not be equivalent, and the formulation of the succinate differs from the tartrate. It is important for you and your doctor to review your medication list and dosing instructions to ensure the safety of your treatment. Your doctor may need to adjust the dose of metoprolol or perform additional monitoring to ensure the medication is working as expected.