";s:4:"text";s:4618:" Phenobarbital is a barbiturate whose major mechanism of action is activation of inhibitory postsynaptic neuronal GABA A receptors (see also Chapter 20). Respiration is affected early. The structural formula is as follows:Each Phenobarbital Tablet, USP contains 15 mg, 30 mg, 60 mg or 100 mg of Pheno…
Like other non-analgesic hypnotic drugs, barbiturates, such as Phenobarbital, when given in the presence of pain, may cause restlessness, excitement, and even delirium. As with other sedatives and hypnotics, elderly or debilitated patients may react to barbiturates with marked excitement, depression, or confusion.The systemic effects of exogenous hydrocortisone and endogenous hydrocortisone (cortisol) may be diminished by Phenobarbital. The duration of action of parenterally administered phenobarbital sodium is usually 4-6 hours. In a few cases, megaloblastic anemia has been associated with the chronic use of Phenobarbital.Controlled Substance - Phenobarbital is a Schedule IV drug.Prolonged, uninterrupted use of barbiturates (particularly the short-acting drugs), even in therapeutic doses, may result in psychic and physical dependence. Protect from light and moisture.Dispense in a tight, light-resistant container as defined in the USP using a child-resistant closure.The easiest way to lookup drug information, identify pills, check interactions and set up your own personal medication records. Its diffusion across the blood-brain barrier and its distribution into other tissues occurs more slowly than with other short-acting barbiturates.
The EEG may be of the “burst-suppression” type, with brief periods of electrical silence.
Select one or more newsletters to continue. Antiseizure activity occurs primarily where GABA mediates neurotransmission. Thus, this product should be administered with caution to patients with borderline hypoadrenal function, regardless of whether it is of pituitary or of primary adrenal origin.Phenobarbital may impair the mental and/or physical abilities required for the performance of potentially hazardous tasks, such as driving a car or operating machinery. Patients taking this drug should be warned not to exceed the dosage recommended by their physician. Among anti-convulsant drugs, behavioural disturbances occur most frequently with Phenobarbital causes a depression of the body's systems, mainly the Phenobarbital is one of the initial drugs of choice to treat Phenobarbital's soporific, sedative and hypnotic properties were well known in 1912, but it was not yet known to be an effective anti-convulsant. Chemically, it is 5-ethyl-5-phenylbarbituric acid with the molecular formula C Each Phenobarbital Tablet, USP contains 15 mg, 30 mg, 60 mg or 100 mg of Phenobarbital, USP.Phenobarbital, a long-acting barbiturate, is a central nervous system depressant. This enzyme is responsible for forming ergosterol. Hypersensitivity reactions in this category include localized swelling, particularly of the eyelids, cheeks, or lips, and erythematous dermatitis. Rarely, exfoliative dermatitis (e.g., Stevens-Johnson syndrome and toxic epidermal necrolysis) may be caused by Phenobarbital and can prove fatal.
Phenobarbital is a barbituric acid derivative for oral administration and occurs as a white, odorless, slightly bitter powder that is soluble in chloroform, freely soluble in alcohol or ether, and slightly soluble in water. Antibiotics may be required to control pulmonary complications.Oral Sedative Dose, Adults - 30 to 120 mg daily in 2 or 3 divided doses.
Phenobarbital is a barbituric acid derivative for oral administration and occurs as a white, odorless, slightly bitter powder that is soluble in chloroform, freely soluble in alcohol or ether, and slightly soluble in water. Ergosterol depletion results in …
Respiratory complications (atelectasis, pulmonary edema, and bronchopneumonia) and renal failure are much dreaded and not infrequent concomitant of severe barbiturate poisoning. The patient should be cautioned accordingly.Phenobarbital in combination with alcohol, tranquilizers, and other central nervous system depressants has additive depressant effects, and the patient should be so advised.
Phenobarbital may act by enhancing and/or mimicking the synaptic action of gamma-aminobutyric acid (GABA), an inhibitory neurotransmitter.