The root bark of this African shrub (Tabernanthe iboga) contains a hallucinogen called ibogaine which acts as a powerful stimulant. The result is great endurance for… well, whatever you may want endless energy for. Depending on your metabolism, the effects last between 15 and 36 hours. Some native tribes in Gabon use it ceremonially for lion hunts, dancing, and all-night sex.
People have developed psychedelic treatments from ibogaine, which when used correctly can apparently help break addictions to anything from alcohol to opiates to cocaine. Having never been addicted to anything other than caffeine, I can’t speak to its efficacy.
Since high doses of iboga may cause convulsions, respiratory collapse, and paralysis, it is considered a Schedule One drug. That means it is illegal in the U.S. and you’ll have to go elsewhere if you want to use it for addiction treatment (or anything else, for that matter). Though it certainly has plausible use in aphrodisiac pursuits, even if not an aphrodisiac itself, its dangers outweigh its benefits.