Effect van leverziekte op de farmacokinetiek: dosisaanpassingen bij leverfunctiestoornissen

Hepatic impairment does not always require drug dose adjustments.

Dose adjustments are not required when the drug primarily undergoes renal excretion with limited hepatic metabolism. They are also unnecessary for gaseous or volatile drugs that are mainly eliminated via the lungs.

Physicians need to evaluate the degree of hepatic impairment, since liver function directly influences drug elimination. They must also consider the pharmacokinetics and pharmacodynamics of each drug before making dose adjustments.

For instance, in aripiprazole, used to treat schizophrenia, no significant difference was found in pharmacokinetics between those with normal and impaired hepatic function, suggesting no need for dosage adjustment.

In contrast, in sildenafil, used for erectile dysfunction, significant pharmacokinetic differences were observed in those with hepatic impairment or the elderly, indicating that a lower starting dose may be necessary.