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The influence of dimeticone (Gel de Polysilane Midy) on the pharmacokinetics and pharmacodynamics of oral ethyl biscoumacetate was studied in 6 healthy volunteers in a randomised single dose, two-way cross-over study. Each volunteer received at one week interval a single dose (300 mg) of ethyl biscoumacetate, either alone or with dimeticone. Ethyl biscoumacetate levels were measured in plasma for 24 hours. Pharmacodynamic parameters were measured for 96 hours. Ethyl biscoumacetate peak concentration was significantly higher when administered with dimeticone (40.3 +/- 25.3 mg/l vs 31.0 +/- 25.7 mg/l; p = 0.031), without significant change in the area under curve. Other pharmacokinetic and pharmacodynamic parameters did not differ significantly. The slight increase of the ethyl biscoumacetate bioavailability with dimeticone in repeated dosing might have pharmacodynamic consequence; a clinical trial should address this question.

Unlabelled: In order to avoid other antibiotics which interfere with plasma and CSF level determination of a given antibiotic the authors use a chemical method of established specificity. 15 patients presenting with purulent meningitis were given a standard daily dose of metampicillin and divided into 3 groups of 5. On days 2, 4 and 6 after onset of disease plasma and CSF specimens were taken at respectively 1, 2 or 4 hours following metampicillin I.V. injection according to patient group. All patients were cured between days 7 and 21 of therapy. Tolerance was good., Results: --there was no correlation between dose injected and plasma level of drug,--CSF distribution of metampicillin was good and stayed identical throughout the disease period,--peak CSF drug level was delayed as compared to plasma level, occurring more than 4 hours after I.V. injection of metampicillin.