Keywords : Isobolographic analysis


Study the analgesic effect of diclofenac and silymarin coadministration in chicks

Yasser M. Albadrany; Ahmed S. Naser; Mohammad M. Hasan

Iraqi Journal of Veterinary Sciences, In Press
DOI: 10.33899/ijvs.2021.127065.1453

The study aimed to investigate the analgesic as well as anti-inflammatory effects of diclofenac and silymarin in chicks. The up and down procedure was used to assess the effective median analgesic dosages (ED50s) of diclofenac and silymarin administered intraperitoneally either alone or at the same time in chicks. Also, Analgesic and anti-inflammatory effects were measured by using the formalin test. Isobolographically, ED50s of drugs were assessed for the manner of interaction between both. Formalin testing also supervised analgesic and anti-inflammatory coadministration impact of diclofenac and silymarin at doses 5 and 40 mg/kg and 2.5 and 20 mg/kg respectively.Analgesic ED50s for diclofenac and silymarin in chicks were 10.74 and 83.4 mg/kg separately. Concomitant administration of drugs at a fixed ratio 0.5:0.5 and 0.25:0.25 of their individual ED50 values reduced their ED50s to 2.10:16.81 mg/kg and 3.90:23.50 mg/kg separately. ED50s isobolographic analysis showed synergistic analgesic effects of both drugs. Additionally, coadministration of both drugs had effective analgesic and anti-inflammatory effect, as seen by formalin test, led to a significant rise in latency to lift right foot beside a significant decline in foot lifting frequency when compared with control value, the anti-inflammatory reaction was demonstrated by a significant decrease in foot thickness compared to control value.In conclusion, the data indicate that diclofenac and silymarin coadministration controls acute pain synergistically, and suppress inflammatory reaction.

Synergism of the analgesic activities of tramadol with α2 adrenoreceptor agonist xylazine in mice

G. A. Taqa

Iraqi Journal of Veterinary Sciences, 2012, Volume 26, Issue 2, Pages 109-113
DOI: 10.33899/ijvs.2012.67485

The present study was undertaken to evaluate the antinociceptive interaction between tramadol and xylazine. The antinociceptive effect of intraperitoneal (I.P) administration of the drug alone or in combination was evaluated using the mouse hot-plate test. Administration of tramadol in fixed dose (20mgkg) I.P with different doses of xylazine (0, 2, 4, 8) mgkg I.P significantly referred synergism of the antinociceptive effect of tramadol depending on the dose of xylazine. There was an increased the antinociceptive maximum possible effect (%MPE) from (27.08%) to (85.4%). The effective dose that produce 50% antinociceptive (ED50) were evaluated for each drug alone or in combination. The present study found that the administration of tramadol and xylazine markedly reduced the median effective dose (ED50) of both drugs for antinociceptive effect in mice. The result of this study demonstrated that there was synergism (super-additive) interaction between tramadol and xylazine.