Paracetamol metabolism in Indian population

Area of Science:

• Pharmacokinetics
• Drug Metabolism
• Toxicology

Background:

• Paracetamol (acetaminophen) is a widely used analgesic and antipyretic.
• Understanding population-specific drug metabolism is crucial for assessing safety profiles.
• Previous studies on paracetamol metabolism have varied across different ethnic groups.

Purpose of the Study:

• To determine the metabolic profile of paracetamol in a healthy Indian population.
• To compare the metabolic profile of Indians with that of other populations.
• To evaluate the potential risk of paracetamol-induced hepatotoxicity in Indians.

Main Methods:

• 100 healthy Indian male volunteers received a 1g oral dose of paracetamol.
• Urine samples were collected for 8 hours post-administration.
• High-performance liquid chromatography (HPLC) was used to quantify paracetamol and its urinary metabolites (sulphate, glucuronide, cysteine, mercapturate conjugates).

Main Results:

• Urinary recovery included: 25.29% sulphate conjugate, 60.55% glucuronide conjugate, 5.05% unchanged paracetamol, 2.76% cysteine conjugate, and 6.37% mercapturate conjugate.
• The mean combined recovery of glutathione conjugates (cysteine and mercapturate) was 9.13% in Indians.
• This recovery rate is comparable to 9.3% observed in Caucasians from Scotland.

Conclusions:

• The high recovery of glutathione conjugates in Indians indicates a metabolic pathway similar to Caucasians.
• This suggests that the Indian population may be equally susceptible to paracetamol-induced hepatotoxicity as Caucasians.
• Further research may be warranted to explore ethnic variations in drug metabolism and toxicity.