Cannabis tinctures are known to be fast-acting because they can be administered sublingually, or under the tongue. The sublingual method provides optimal absorption into the bloodstream. Once a dose is placed under the tongue, it is recommended to wait for at least 15 seconds to one minute before swallowing in order to experience the maximum effect, which should occur within 15 to 30 minutes. Relief with cannabis tinctures can last up to four to six hours per dose.