Best allergy medicine

As

So for the past few years my husband has developed this really chesty, mucus cough. Usually it happens in the fall and spring time. He ends up coughing so much and so hard that he throws up. He just switched and his insurance hasn’t kicked in so he refuses to go to the doctor. I finally got him talked into taking an allergy pill to see if that’ll help. He ended up buying a really cheap off brand one that he’s suppose to take every 4-6 hours but he tends to forget most of the time so it hasn’t been helping. What are some better allergy meds he can try that only require you take it once a day?