Question: what are the side effects of taking doxycycline monohydrate?
Answer: bloating. chills. ... 
cough. dark urine. ... 
diarrhea, watery and severe, which may also be bloody. difficulty with swallowing. ... 
fever. ... 
hives or welts, itching, or rash. ... 
nausea. ... 
pain in the stomach, side, or abdomen, possibly radiating to the back. ... 
sores, ulcers, or white spots in the mouth or on the lips.