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Pharmacokinetics (PK) studies are critical because they provide vital insights into the drug's behaviour in the body, helping identify potential safety risks early in development. PK studies focus on drug absorption, distribution, metabolism, and excretion (ADME), and pharmacovigilance ensures the data is carefully monitored for safety concerns. Here's how pharmacovigilance integrates into PK studies:

1. Absorption and Bioavailability Pharmacovigilance monitors the rate and extent of absorption to detect any adverse effects related to how the drug is absorbed in different individuals. Poor or variable absorption can lead to adverse drug reactions (ADRs), especially in populations with differing metabolic profiles.

2. Distribution and Tissue Accumulation Pharmacovigilance tracks drug distribution to identify any abnormal accumulation in non-target tissues that could lead to toxicity (e.g., hepatotoxicity or nephrotoxicity). For example, a drug accumulating in the liver may trigger early signals of liver damage.

3. Metabolism Metabolic studies identify how a drug is processed by the body, particularly by liver enzymes such as CYP450. Pharmacovigilance assesses these data to predict drug-drug interactions or metabolite formation, which might be active or toxic. Metabolism variations among populations (due to genetic factors) are also monitored to detect adverse reactions related to poor or rapid metabolisers.

4. Excretion Monitoring how the drug and its metabolites are excreted (primarily through urine or bile) can reveal potential renal or hepatic impairment. If excretion pathways are compromised, pharmacovigilance can detect signs of toxicity or drug accumulation.

5. Dose Adjustment and Risk Minimization PK data guides dose selection, and pharmacovigilance ensures that dose adjustments are made based on the patient's metabolic capacity or other pharmacokinetic factors, minimising the risk of ADRs.

6. Signal Detection and Reporting: Any unexpected findings during PK studies, such as abnormal levels of drug exposure or ADRs, are reported to regulatory authorities, ensuring early signal detection and safety assessments. Pharmacovigilance plays a vital role in integrating PK data into broader safety assessments, ensuring that a drug’s pharmacokinetic profile does not pose risks to patient safety​

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