Best over the counter medication

Patient: What over the counter cold remedies for a stuffy nose, sore throat and cough can you take when on the following medication?Metformin hydrochloride 1500mg per dayAtorvastatin 10mg per dayDoxazosin 12mg per dayLisinopril 30mg per day

Symptoms: Sore throat, blocked nose, aches & pains and cough