Bad stomach pain after doctor at hospital gave me a single dose of zpack 1000 mg which is 4 pills will this harm me i already have bad acid reflux

Side effect: common side effect with this family of drugs. It will get better and should not affect your heart burn for long time.

Too much : Unless you are extremely large, the z-pack is 6 pill package that is taken daily over 5 days as follows : 2 pills on day 1, 1 pill daily x 4 days. You took the whole 5 day course at one time, which will give you significant gastrointestinal problems for a while, but you will be ok. I suggest your doctor learn how to orescribe or give directions on how to take a z-pack, should be on the package !