Did you eat so much? Don't feel sick? The most common adverse reactions are headache, diarrhea and nausea. Other adverse reactions include rhinitis, abdominal pain, weakness, flatulence, pharyngitis, vomiting, nonspecific pain or back pain, dizziness, flu symptoms, infectious cough, constipation and insomnia. If you have any reaction, go to the hospital for gastric lavage and vomiting.