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headache, nausea, and skin rash.
Special Precautions & Warnings:Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking threonine if you are pregnant or breast-feeding. Stay on the safe side and avoid use.
Amyotrophic lateral sclerosis (Lou Gehrig's disease):There is some concern that threonine might decrease lung function in patients with ALS. In one study, ALS patients taking 1 gram of threonine four times per day for 6 months had significantly reduced lung function compared to patients who did not receive threonine. More evidence is needed to determine if threonine was actually at fault.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.