What Dosage Of Proprananol Can Be Taken Along With Citalopram?

I take 20 mg of citalopram every day. I was recently prescribed proprananol for migraine headaches by my VA doctor. I have not started the proprananol as I have not yet received it in mail. I don t know what the mg will be. The VA dr didn t know I was on citalopram because I got it from my local dr and forgot to put it on my VA list of medicines. Could there be a drug interaction and should I contact my VA dr before starting the proprananol?