I was just put on atenelol 25mg 2x a day I started on 8/22 how long for full benefit from this medication.

Atenolol. It depends on the indication for the drug,for steady state response in BP treatment one looks for 2-3 weeks before making further medication change.Atenolol can work well as a once a day drug.Avoid Aleve (naproxen) (other NSAID's-ask your pharmacist)