Aims: In spite of folkloric use of the root of Carpolobia lutea as sexual stimulant in man, there has been limited scientific proof of its efficacy. This study evaluates efficacy of methanol extract of Carpolobia lutea root (MECLR) on sexual activity of male rabbits.
Methods: Twenty adult male rabbits were grouped into four of five rabbits each. Groups 1-4 were treated orally for 28 days with 2ml/kg 1% tween 20 (vehicle), 40mg/kg MECLR, 80mg/kg MECLR, and 0.5mg/kg sildenafil citrate respectively. Sexual activities of males from each group was assessed by cohabiting them with sexually receptive female at estrus on days 0,1,3 and 5 using digital camera mounted on mating arena. Serum testosterone and nitric oxide concentration of the corpora cavernosa homogenates were also determined.
Results: MECLR caused a dose dependent significant increase in mount frequency, intromission frequency and ejaculatory latency, while it reduced mount latency, intromission latency and post ejaculatory latency (similar to sildenafil citrate) when compared with the control. MECLR also caused a significant increase in nitric oxide concentration in corpora cavernosa but no change in serum testosterone concentration.
Conclusions: Results suggest that MECLR enhances male sexual activity possibly by augmenting nitric oxide concentration. This study thus provides novel scientific rationale for the use of Carpolobia lutea in the management of penile erectile dysfunction and impaired libido.
Key words: Carpolobia lutea, aphrodisiac, efficacy, male, rabbits
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