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Phenylalanine is used to treat a skin condition called vitiligo (condition in which some portion of skin start losing the pigment). It is also used for depression, Parkinson's disease, attention deficit-hyperactivity disorder (ADHD), alcohol withdrawal symptoms, chronic pain, osteoarthritis and rheumatoid arthritis (pain and swelling of joints).

How it works

Phenylalanine is an amino acid and the exact mechanism of its action is not clearly understood.

Common side effects


No medicine available

Expert advice

  • Do not take phenylalanine if you are allergic (hypersensitive) to phenylalanine.
  • Do not take phenylalanine if you have schizophrenia (psychiatric condition); or genetic disorder such as phenylketonuria or alkaptonuria.
  • Avoid using phenylalanine if you are pregnant or breast feeding.

Frequently asked questions


Q. Is phenylalanine safe?
Phenylalanine is safe if used in amounts found in foods and as medicines by persons who have normal phenylalanine levels. Patient should follow the advice of the doctor regarding its use.
Q. Is phenylalanine gluten free?
Yes. Phenylalanine is gluten free. However, please refer to package insert of the prescribed brand before use.
Q. Does phenylalanine cause cancer/weight gain/gas/diarrhea/keep you awake/ headache/raise blood pressure?
Phenylalanine causing these side effects is very rare. However, always consult your doctor if you experience any of these side effects.
Q. Does phenylalanine work?
Phenylalanine works if used at prescribed doses for the prescribed duration as advised by your doctor.

Content on this page was last updated on 30 September, 2016, by Dr. Varun Gupta (MD Pharmacology)