Can i take atenolol 1/2 pill 25mg with paxil (paroxetine) 20mg for mild panic anxiety ?

Anxiety: Yes there is no interaction between the two drugs.

Yes: Paxil may raise the blood level of your atenolol, but your atenolol dose is low enough that this should not be a problem. With the Paxil watch out for sexual difficulties and weight gain. If either one happens have your doctor switch you to pexeva, paroxetine mesylate. It is a branded generic that does not often cause weight gain and far less frequently causes sexual side effects.