Augustin, Marc and Schoretsanitis, Georgios and Gruender, Gerhard and Haen, Ekkehard and Paulzen, Michael (2018) How to Treat Hypertension in Venlafaxine-Medicated PatientsPharmacokinetic Considerations in Prescribing Amlodipine and Ramipril. JOURNAL OF CLINICAL PSYCHOPHARMACOLOGY, 38 (5). pp. 498-501. ISSN 0271-0749, 1533-712X
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Background Amlodipine (AMLO) and ramipril (RAMI) belong to the most prescribed drugs in patients with hypertension, a condition also encountered in depression. Venlafaxine may worsen hypertension because of noradrenergic properties. Although of special clinical relevance, data on pharmacokinetic interactions between AMLO, RAMI, and venlafaxine (VEN) are lacking. Methods Two TDM databases consisting of plasma concentrations of VEN and its active metabolite O-desmethylvenlafaxine (ODVEN) were analyzed. We considered a group of patients comedicated with AMLO, V-AMLO (n = 22); a group comedicated with RAMI, V-RAMI (n = 20); and a 4:1 control group age matched to the V-AMLO group receiving VEN without confounding medications, V-0 (n = 88). Plasma concentrations of VEN, ODVEN, and active moiety, AM (VEN + ODVEN); metabolic ratio (ODVEN/VEN); and dose-adjusted plasma concentrations (C/D) were compared using nonparametric tests. Results Groups did not differ in daily VEN dose, age, or sex. The metabolic ratio (ODVEN/VEN) was lower in the AMLO group (P = 0.029), whereas the RAMI group showed lower values for ODVEN (P = 0.029). All other parameters showed no significant differences. Conclusions Significantly lower values for the metabolic ratio in the AMLO group are unlikely to be explained by cytochrome P450 (CYP) 3A4 and weak CYP2D6 inhibition by AMLO. Other factors such as differences in CYP2D6 polymorphisms and metabolizer status may better explain the findings. Ramipril showed modest effects with changes in ODVEN concentrations that did not remain significant after dose-adjusted comparisons.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CALCIUM-CHANNEL BLOCKERS; DRUG-DRUG INTERACTIONS; PHARMACOKINETIC CONSIDERATIONS; IN-VITRO; RISPERIDONE; CYP2D6; GENOTYPE; ANTIPSYCHOTICS; METABOLISM; DEPRESSION; therapeutic drug monitoring; venlafaxine; amlodipine; ramipril; cytochrome P450; interaction; CYP3A4; pharmacokinetics |
| Subjects: | 500 Science > 570 Life sciences 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Psychiatrie und Psychotherapie Chemistry and Pharmacy > Institute of Pharmacy > Pharmacology and Toxicology (Prof. Schlossmann, formerly Prof. Seifert) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 11 Dec 2019 10:19 |
| Last Modified: | 11 Dec 2019 10:19 |
| URI: | https://pred.uni-regensburg.de/id/eprint/13807 |
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