Should atenolol and metoprolol taken at the same time walgreens pharmacist advised not to?

No: These are both from the same medication class, beta-blockers. It would be extremely unusual for a physician to prescribe these simultaneously and could be potentially very dangerous. You should absolutely clarify with your physician whether this was intentional and if so, what the reason was for prescribing them both together.

Beta Blockers: Nope. They should not be taken together. Please contact the prescribing physician for clarification.