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LSD, MDMA, morphine, alprazolam, clonazepam, diazepam, and many other substances including the psychedelic tryptamines and phenethylamines, and even recreational cannabis edibles are all viable candidates for administration via this route.
The intracerebral route can also interrupt the blood brain barrier from holding up against subsequent routes. [19] Intracerebroventricular (into the cerebral ventricles) administration into the ventricular system of the brain. One use is as a last line of opioid treatment for terminal cancer patients with intractable cancer pain. [20]
This process occurs down the concentration gradient when drug molecules move to one area to another region. Diffusion is described by a mathematical equation. [ 1 ] [ 4 ] The drug molecule (J), known as flux and it represents the entry of topical drug molecules across the skin membrane .
Subcutaneous administration is the insertion of medications beneath the skin either by injection or infusion. A subcutaneous injection is administered as a bolus into the subcutis, the layer of skin directly below the dermis and epidermis, collectively referred to as the cutis. The instruments are usually a hypodermic needle and a syringe.
Diazepam, sold under the brand name Valium among others, is a medicine of the benzodiazepine family that acts as an anxiolytic. [15] It is used to treat a range of conditions, including anxiety , seizures , alcohol withdrawal syndrome , muscle spasms , insomnia , and restless legs syndrome . [ 15 ]
A benzodiazepine can be placed into one of three groups by its elimination half-life, or time it takes for the body to eliminate half of the dose. [189] Some benzodiazepines have long-acting active metabolites, such as diazepam and chlordiazepoxide, which are metabolised into desmethyldiazepam. Desmethyldiazepam has a half-life of 36–200 ...
Diazepam (1963). Can be given rectally by trained care-givers. Midazolam (N/A). Increasingly being used as an alternative to diazepam. This water-soluble drug is squirted into the side of the mouth but not swallowed. It is rapidly absorbed by the buccal mucosa. Lorazepam (1972). Given by injection in hospital.
First-pass metabolism may occur in the liver (for propranolol, lidocaine, clomethiazole, and nitroglycerin) or in the gut (for benzylpenicillin and insulin). [4] The four primary systems that affect the first pass effect of a drug are the enzymes of the gastrointestinal lumen, [5] gastrointestinal wall enzymes, [6] [7] [8] bacterial enzymes [5] and hepatic enzymes.