dissolve rapidly and with little or no residue. Nitroglycerine tablets are an example, the anti-emetic ondansetron is another. Sublingual strips—similar to tablets in that they easily melt in the mouth and dissolve rapidly. Suboxone is an example of medication that comes in a sublingual strip. Multi-purpose tablets—Soluble tablets for either oral or sublingual (or buccal) administration, often also suitable for preparation of injections, Hydrostat (hydromorphone) and a number of brands of morphine tablets and cubes. Sublingual drops—a concentrated solution to be dropped under the tongue, as with some nicocodeine cough preparations, Sublingual spray—spray for the tongue; certain human and veterinary drugs are dispensed as such. Lozenge—effects a metred and patient-controlled-rate combination of sublingual, buccal, and oral administration, as with the Actiq fentanyl. Effervescent buccal or sublingual tablets—this method drives the drug through the mucous membranes much faster (this is the case in the stomach with carbonated or effervescent liquids as well) and is used in the Fentora fentanyl buccal tablet. Substance Almost any form of substance may be amenable to sublingual administration if it dissolves easily in saliva. Powders and aerosols may all take advantage of this method. However, a number of factors, such as pH, molecular weight, and lipid solubility, may determine whether the route is practical. Based on these properties, a suitably soluble drug may diffuse too slowly through the mucosa to be effective. However, many drugs are much more potent taken sublingually, and it is generally a safer alternative than administration via the nasal mucosa. This method is also extensively used by people administering certain psychoactive drugs. One drawback, however, is tooth discoloration and decay caused by long-term use of this method with acidic or otherwise caustic drugs and fillers. Psychoactives In addition to salvinorin A, other psychoactives may also be applied sublingually. LSD, MDMA, morphine, alprazolam, clonazepam, diazepam, and many other substances including the psychedelic tryptamines and phenethylamines, and even recreational cannabis edibles (THC) are all viable candidates for administration via this route. Most often, the drug in question is powdered and placed in the mouth (often directly under the tongue). If held there long enough, the drug will diffuse into the blood stream, bypassing the GI tract. This may be a preferred method to simple oral administration, because MAO is known to oxidize many drugs (especially the tryptamines such as DMT) and because this route translates the chemical directly to the brain, where most psychoactives