Aminolevulinic acid phosphate

Aminolevulinic acid phosphate is a topically administered metabolic precursor of protoporphyrin IX. After topical administration, aminolevulinic acid (ALA) is converted to protoporphyrin IX (PpIX), a photosensitizer. When the proper wavelength of light activates protoporphyrin IX, singlet oxygen is produced, resulting in a local cytotoxic effect.

Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).