Journal Publication

Ciprofol clears slower and sedates deeper in elderly patients, PK/PD study finds

A 40-patient comparative study finds age-related drops in ciprofol clearance drive higher exposure and more adverse events, while sedation depth on key measures stayed equivalent.

By AppliedXLJuly 14, 2026

Executive Summary

Researchers compared how ciprofol, an intravenous sedative-hypnotic, is cleared and how it acts on sedation depth in elderly versus younger surgical patients.
Elderly patients cleared the drug more slowly and carried higher blood levels than younger patients, while reaching a similar depth of sedation on the primary brain-monitoring measure.
Adverse events occurred more often in the elderly group, aligning with the higher drug exposure the pharmacokinetic data showed.
The results point toward closer intraoperative monitoring and individualized dosing for older patients rather than a uniform ciprofol regimen across age groups.

The study

Ciprofol is administered intravenously for anesthesia induction and maintenance during surgery. This study set out to define how the drug's pharmacokinetics (how the body absorbs, distributes, and clears a drug) and pharmacodynamics (the drug's effect on the body) differ between young and elderly patients undergoing general anesthesia, information relevant to dosing decisions for an aging surgical population. A

How it was done

The non-randomized study enrolled 40 patients scheduled for elective surgery, split into a young group (ages 20 to 45, n=20) and an elderly group (ages 65 to 85, n=20). All participants received ciprofol at a 0.4 mg/kg induction dose and 0.8 mg/kg per hour maintenance infusion. Investigators drew arterial blood at 20 predefined time points and analyzed plasma concentrations using ultra-high-performance liquid chromatography-tandem mass spectrometry, then calculated pharmacokinetic parameters with non-compartmental analysis. Pharmacodynamic response was tracked with the bispectral index, a measure of anesthetic depth derived from brain activity, and the Modified Observer's Assessment of Alertness/Sedation scale. A

The pharmacokinetic result

The elderly group showed a total body clearance of ciprofol of 0.60 L/h/kg versus 0.75 L/h/kg in the young group (p<0.001), and an elimination half-life of 3.40 hours versus 2.68 hours (p=0.003). Drug exposure, measured by area under the concentration curve, was significantly higher in elderly patients on both partial and total exposure measures (p=0.016 and p=0.018). A

The sedation result

Elderly patients reached deeper sedation than younger patients during the infusion, yet equivalence analysis confirmed that the two groups were clinically equivalent on the key bispectral index parameters, peak value and area under the sedation curve. The study's exploratory analysis of plasma concentration against sedation depth estimated an effective sedative range of roughly 400 to 700 ng/mL. A

Safety and implication

Adverse events were more frequent in the elderly group than the young group. The authors concluded that ciprofol shows delayed clearance and increased hemodynamic sensitivity (blood-pressure and heart-rate responsiveness) in elderly patients, and recommended enhanced intraoperative monitoring and individualized dosing strategies for this population. A

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