Yohimbe. Before Viagra and the other prescription erectile dysfunction drugs became available, doctors sometimes prescribed a derivative of the herb yohimbe (yohimbine hydrochloride) to their patients suffering from ED. But experts say the medication is not particularly effective, and it can cause jitteriness and other problems. "It's not a great drug," says McCullough. "And I suspect the herb is not as potent as the pharmaceutical version." What's more, evidence shows that yohimbe is associated with high blood pressure, anxiety, headache, and other health problems. Experts discourage its use.
Tongkat Ali (Eurycoma longiflora) (Figure 7): this native plant found through SE Asia is used as an Aphrodisiac since 1996 (5). It has to be used regularly and works by enhancing the testosterone and cGMP production. Benefits are felt gradually over a period of time, mainly because it enhances the natural biological synthesis of testosterone. When the level is increased, health and vitality are restored. In studies on Mice, Tongkat Ali increases the number of times and duration of sexual performance of the animals under study (8) with testosterone levels increasing up to 440% in some animals. In a recent study on humans, 62% of subjects showed an increase of the free testosterone index indicating it’s biostimulatory effect on steroidogenesis. It has also been shown to increase sperm concentration and motility and increases energy in the individual by enhancing ATP production by 60% thru oxidative phosphorylation.
In modern medication of erectile dysfunction, the oral prescription medication of popular Viagra (Sildenafil) is effective, but in some men it is not compatible and Sildenafil works in less than 70% of men with various etiologies and has certain side effects23. The availability of Viagra has brought millions of couples to ED treatment. Oral testosterone can reduce ED in some men with low levels of natural testosterone, but it is often ineffective and may cause liver damage34. Other drugs such as Yohimbine, papaverine hydrochloride [used under careful medical supervision]5, phentolamine, and alprostadil (marketed as Caverject) widen blood vessels. However, this available modern medication for the ED in men is very expensive for most of the rural people in Ugandan and other developing countries. Yet, in traditional medicine, there are several medicinal plants that have been relied on for use in the treatment of ED. This ethnobotanical indigenous knowledge has not been earlier documented and scientifically validated for efficacy and safety, future drug discovery and development.
With wide-ranging action, ginseng (Panax ginseng), also called Asian ginseng, has been shown in human studies to have an anti-stress effect; improve physical and mental performance, memory, and reaction time; and to enhance mood. Ginseng increases physical working capacity in humans in many ways, including by stimulating the central nervous system, and regulating blood pressure and glucose levels. A 2015 study found that active constituents in ginseng had significant benefit for ED in men with diabetes.
L-arginine, or arginine, is an amino acid found in red meat, poultry, fish, and dairy products that helps expand blood vessels and increase blood flow. “The body uses this semi-essential amino acid as the primary building block for nitric oxide,” explains Harry Fisch, M.D., clinical professor of urology and reproductive medicine at Weill Cornell Medical College/New York Presbyterian Hospital.
Historically, it has been shown that herbal medicines may cure or prevent certain ailments. However, there are very little recorded data available to support the dose, efficacy, side effects and interactions. Because the safety and efficacy of herbal remedies have not been assessed, unlike synthetic drugs, well-controlled and randomized studies are warranted to establish the therapeutic efficy and safety of such products. Determination of side effects and interactions with prescription medicines are also needed. The amount of active ingredients in herbals may vary among preparations; thus, standardization of herbal medicines is required.
The semi-structured interviews and discussions were held with the specialist resource users and other knowledgeable people on particular ailments by use of interview schedules for each respondent. Interviewed people were mainly the herbalists (both men and women) and TBAs. In this selection to some extent, ethnic groups were recorded where possible because different people use the same plants differently. The time and place of interviews were arranged according to the schedules of the respondent. Depending on where the interviews and discussions were held, recording was done immediately or afterwards or appointments were made for more details in a more convenient place arranged with the respondent. Key informants were identified and later interviewed separately and even followed for further details. Some of the key questions asked included, name of the respondents, the village or parish or sub-county he or she was coming from, diseases treated, plant local names used, parts harvested, methods of preparation and administration. In addition, ingredients and incantations with which the plants are used for preparation and where the herbal medicines were harvested were documented.
Ginseng. Korean red ginseng has long been used to stimulate male sexual function, but few studies have tried systematically to confirm its benefits. In one 2002 study involving 45 men with significant ED, the herb helped alleviate symptoms of erectile dysfunction and brought "enhanced penile tip rigidity." Experts aren't sure how ginseng might work, though it's thought to promote nitric oxide synthesis. "I would recommend ginseng [for men with ED]," says Espinosa. Discuss with your doctor before taking it since ginseng can interact with drugs you may already be taking and cause allergic reactions.
Ginkgo biloba may increase blood flow to the penis. Researchers discovered the effect of gingko on ED when male participants in a memory enhancement study reported improved erections. Another trial saw improvement in sexual function in 76 percent of the men who were on antidepressant medication. This is why researchers believe that ginkgo may be effective for men who are experiencing ED due to medication.