My Husband Has Been Taking G.E.ED-CHLORTAN 4 MG TABLETS 1

My husband has been taking G.E.ED-CHLORTAN 4 MG TABLETS 1 two times daily. He has had a kidney transplant and the doctor prescribed this for him. It really helps his ongoing sinus problem. I was told that Chlorpheniramine 4 mg is the same product. I was trying to buy it over the counter because with the prescription, it cost $10.55 per month. Just want to make sure this is the same allery medication.