L-tryptophan (Tryptophan, Tryptan) (cont.)

Pharmacy Author:
Medical and Pharmacy Editor:

DRUG INTERACTIONS: L-tryptophan should be used with caution with other anti-depressants like citalopram (Celexa), desvenlafaxine (Pristiq), vilazodone, linezolid, and phenelzine because of increased risk of a serious condition called serotonin syndrome caused by excessive serotonin in the brain.

PREGNANCY: There are no adequate studies done on L-tryptophan to determine safe and effective use in pregnant women.

NURSING MOTHERS: It is not known whether L-tryptophan enters breast milk; however, it is best to avoid L-tryptophan during breastfeeding to avoid risk to the newborn.

SIDE EFFECTS: Side effects of L-tryptophan are weight loss, dizziness, dry mouth, headache, nausea, and improper sexual behavior.

REFERENCE: FDA.gov.


Medically Reviewed by a Doctor on 5/29/2014


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.

Pill Finder Tool

Need help identifying pills and medications?
Use the pill identifier tool on RxList.


Back to Medications Index