Intensity of adverse reactions to oral ingestion of N-acetylcysteine (NAC) solution. GI = gastrointestinal (upset stomach, nausea, stomach or intestinal gas); other = non-GI (sleepiness; metallic taste; light-headedness; redness of eye, face, or hand; cough; welts; and wheezing). Data are M ± SE of highest intensity of a side effect in each category. *p < .05 vs. placebo. #p < .05 vs. 35 mg/kg (Hollander post hoc test).