My doctor prescribes antibiotics when I have been sick with a cold for a week or so. I've been reading so much about antibiotic resistance and wonder if she is overdoing it. I've developed an allergy to two groups possibly because of overdoing it...not sure. Does your doctor prescribe antibiotics whenever you are sick with a cold/flu...I'm just wondering what the consensus is out there. Currently I'm on a Penicillin for ten days because I had the flu over a week ago and was still sick when I went to see her after a week. Does that make sense? It might be helping because I feel better but I'm wondering if I would have felt better anyways. Also, is there a definitive test to see if you have a virus or infection (need antibiotics).