Related Experiment Video
Updated: May 15, 2025

Diagonal Method to Measure Synergy Among Any Number of Drugs
Published on: June 21, 2018
Combined effects of Aloe vera leaf extract and vitamin E on wound healing in Oryctolagus cuniculus (Rabbits)
Anila Khan1, Shakeeb Ullah2, Faiqah Ramzan2
1Institute of Biological Sciences, Gomal University, Dera Ismail Khan, Pakistan.
Background:
Wound healing is a complex process involving inflammation, proliferation, and tissue remodeling. Aloe vera and vitamin E (Evion®) are well-known for their wound-healing properties because of their anti-inflammatory, antioxidant, and collagen-promoting effects.
Aim:
This study aimed to evaluate the comparative efficacy of A. vera leaf extract, vitamin E, and their combined application on wound healing in rabbits (Oryctolagus cuniculus).
Methods:
Twenty male rabbits were divided into four groups: control (treated with saline), A. Vera, vitamin E, and combined (A. Vera + vitamin E). Full-thickness wounds were created on the dorsum of each rabbit, and treatments were applied daily for 14 days. Wound closure rates were measured on days 0, 4, 7, 10, and 14, followed by histopathological and biochemical analyses.
Results:
By day 14, the combined treatment group demonstrated the most significant wound closure, reducing the wound area by 75% compared with 50% in the A. Vera group, 55% in the vitamin E group, and 35% in the control group. Histopathological analysis showed near-complete re-epithelialization, dense granulation tissue, and enhanced collagen deposition in the combined treatment group. The biochemical results indicated that the hydroxyproline levels were highest in the combined group (6.0 mg/g tissue) and that the antioxidant enzyme activity was elevated.
Conclusion:
These findings suggest a synergistic effect between A. Vera and vitamin E, leading to accelerated wound healing and improved tissue repair. The combination treatment has the potential to be a superior therapeutic approach for wound management.
Related Concept Videos
Combined Effects of Drugs: Synergism
Such synergistic combinations...
Combined Effects of Drugs: Antagonism
The most common type is receptor antagonism, where one drug acts as an antagonist to block the effects of another drug by...
Agonism and Antagonism: Quantification
To quantify these effects, researchers use a dose-response curve, which provides valuable information about the potency and efficacy of a drug. Potency refers to...
Effects of Chemicals: Overview
Adrenergic Agonists: Indirect-Acting Agents
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral...
Toxic Reactions: Overview
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...

