I went to the doctor the other day because of post-nasal drip (followed by cold and sore throat on multiple ocassions), and she diagnosed me with sinus infection and put me on amoxicillin with clavulanic acid (875+125 dosage). However when the time came for me to take my pill, I realized I was unable to swallow it, even if I break it in half. I couldn't swallow partially because of my post-nasal drip and partially because of my problem with swallowing larger pills (I have no such problems with smaller pills). I cut it in eight pieces and ingested them. My post-nasal drip was almost completely eliminated after the first dose. However, later that day I learned that the pills were coated and that they shouldn't be cut. I went back to the doctor and she gave me Amoxicillin 1000mg oral suspension. I was doing fine but after 4 days on my new pills post-nasal drip resurfaced. I also had unilateral headache and some neck ache first days of my new pills. I would like to know what, in your opinion, caused my symptoms to return? Could it be that I reacted positively to Amoxil-Clav and me being symptom free was due to its residual effect? Could it be that bacteria became resistant to Amoxicillin? I was taking 2000mg Amoxicilin a day. I also made quite a break when changing medication. I took Amox-Clav pills at 9 in the evening, and next dose of antibiotic at 2pm another day. I know that symptoms like post-nasal drip can linger for a while, but what troubles me is the fact it initially responded to treatment and returned after 4 days. and the fact that I might have been ok, had I stuck to the original treatment. I also thought that post-nasal drip might be due to food allergy(to soy), but after antibiotic helped the symptom I became a bit suspicious. Post nasal drip is very distracting and my doctor doesn't even seem to listen. I would really appreciate advice on how to proceed. Should I see another doctor? Should I be put on second course of (perhaps different) antibiotics?