PMID- 18471144 OWN - NLM STAT- MEDLINE DCOM- 20080724 LR - 20191210 IS - 1365-2885 (Electronic) IS - 0140-7783 (Linking) VI - 31 IP - 3 DP - 2008 Jun TI - Evaluation of the interaction between ivermectin and albendazole following their combined use in lambs. PG - 230-9 LID - 10.1111/j.1365-2885.2008.00953.x [doi] AB - Mixtures of drugs from different chemical families have been proposed as a valid strategy to delay the development of anthelmintic resistance. The current work summarizes the outcome of the evaluation of the plasma disposition kinetics of albendazole (ABZ) and ivermectin (IVM) administered either alone or co-administered to lambs infected with gastrointestinal (GI) nematodes resistant to both anthelmintic molecules. Thirty six (36) Corriedale lambs naturally infected with multiple resistant GI nematodes were allocated into six treatment groups: (a) ABZ intravenous (ABZ(IV)); (b) IVM(IV); (c) ABZ(IV) + IVM(IV); (d) ABZ intraruminal (IR); (e) IVM subcutaneous (SC) and (f) ABZ(IR) + IVM(SC). Plasma samples were collected over 15 days post-treatment and analysed by HPLC. The estimated pharmacokinetic (PK) parameters were statistically compared using parametric and non-parametric statistical tests. The presence of IVM did not affect the plasma disposition kinetics of ABZ and its metabolites after the i.v. administration. However, the ABZ sulphoxide (ABZSO) area under the concentration vs. time curve (AUC) was significantly lower (P < 0.01) after the intraruminal (i.r.) administration of ABZ alone compared to that obtained for the combined treatment with IVM [subcutaneous (s.c.) injection]. The IVM plasma AUC obtained after its i.v. co-administration with ABZ was 88% higher (P < 0.05) compared to the treatment with IVM alone. Any marked difference on IVM PK parameters was observed between the treatments ABZ + IVM and IVM alone injected subcutaneously. The data obtained here indicate that the co-administration of ABZ and IVM does not induce an adverse kinetic interaction. This type of pharmacology-based evaluation of drug interactions is becoming highly relevant as drug combinations are now widely used as an alternative to control resistant helminth parasites in livestock. FAU - Alvarez, L AU - Alvarez L AD - Laboratorio de Farmacologia, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Campus Universitario, Tandil, Argentina. FAU - Lifschitz, A AU - Lifschitz A FAU - Entrocasso, C AU - Entrocasso C FAU - Manazza, J AU - Manazza J FAU - Mottier, L AU - Mottier L FAU - Borda, B AU - Borda B FAU - Virkel, G AU - Virkel G FAU - Lanusse, C AU - Lanusse C LA - eng PT - Evaluation Study PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - England TA - J Vet Pharmacol Ther JT - Journal of veterinary pharmacology and therapeutics JID - 7910920 RN - 0 (Anthelmintics) RN - 70288-86-7 (Ivermectin) RN - F4216019LN (Albendazole) SB - IM MH - Albendazole/metabolism/pharmacokinetics/*therapeutic use MH - Animals MH - Anthelmintics/blood/pharmacokinetics/*therapeutic use MH - Area Under Curve MH - Biological Availability MH - Chromatography, High Pressure Liquid MH - Dose-Response Relationship, Drug MH - Drug Interactions MH - Drug Therapy, Combination MH - Female MH - Half-Life MH - Ivermectin/blood/pharmacokinetics/*therapeutic use MH - Metabolic Clearance Rate MH - Nematode Infections/drug therapy/*veterinary MH - Sheep MH - Sheep Diseases/*drug therapy/metabolism MH - Tissue Distribution EDAT- 2008/05/13 09:00 MHDA- 2008/07/25 09:00 CRDT- 2008/05/13 09:00 PHST- 2008/05/13 09:00 [pubmed] PHST- 2008/07/25 09:00 [medline] PHST- 2008/05/13 09:00 [entrez] AID - JVP953 [pii] AID - 10.1111/j.1365-2885.2008.00953.x [doi] PST - ppublish SO - J Vet Pharmacol Ther. 2008 Jun;31(3):230-9. doi: 10.1111/j.1365-2885.2008.00953.x.