Can I Take Clonidine With Atenolol ? What Are Side

Can I take clonidine with atenolol ? What are side effects of doing so ? One of my drs. removed atenolol .I think he said it had the same ingredients . Been having shortness of breath ,dizziness and drawsiness . Do I need to contact him Monday to verify what he said ? I stopped taking atenolol last night . Seems better today . want to verify...Thanks