Biomaterial Database

Pharmacokinetics of ranitidine in quadriplegics. 1985

D G More, and C J Watson, and J S Boutagy, and G M Shenfield

In a previous study we observed that quadriplegic patients were unresponsive to ranitidine given in high dose (600 mg day-1 intravenously) for prophylaxis of stress ulceration. The pharmacokinetics of 100 mg of intravenous ranitidine have therefore been studied in six male quadriplegic patients. Plasma drug concentrations declined in a biexponential fashion. The mean (+/- s.e. mean) distribution half-life was 9.42 (+/- 1.04) min. The terminal plasma elimination half-life 1.79 (+/- 0.12) h, the volume of distribution 103 (+/- 17) litres and total body clearance 663 (+/- 86) ml/min. These values are similar to those described in two published studies performed in normal male volunteers. This suggests that there is no pharmacokinetic reason for the quadriplegics to be resistant to ranitidine and the defect is likely to be related to vagal control of acid secretion.

UI	MeSH Term	Description	Entries
D007700	Kinetics	The rate dynamics in chemical or physical systems.
D008297	Male		Males
D008875	Middle Aged	An adult aged 45 - 64 years.	Middle Age
D008954	Models, Biological	Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.	Biological Model,Biological Models,Model, Biological,Models, Biologic,Biologic Model,Biologic Models,Model, Biologic
D011782	Quadriplegia	Severe or complete loss of motor function in all four limbs which may result from BRAIN DISEASES; SPINAL CORD DISEASES; PERIPHERAL NERVOUS SYSTEM DISEASES; NEUROMUSCULAR DISEASES; or rarely MUSCULAR DISEASES. The locked-in syndrome is characterized by quadriplegia in combination with cranial muscle paralysis. Consciousness is spared and the only retained voluntary motor activity may be limited eye movements. This condition is usually caused by a lesion in the upper BRAIN STEM which injures the descending cortico-spinal and cortico-bulbar tracts.	Quadriparesis,Spastic Quadriplegia,Tetraplegia,Flaccid Quadriplegia,Flaccid Tetraplegia,Paralysis, Spinal, Quadriplegic,Spastic Tetraplegia,Flaccid Quadriplegias,Flaccid Tetraplegias,Quadripareses,Quadriplegia, Flaccid,Quadriplegia, Spastic,Quadriplegias,Quadriplegias, Flaccid,Quadriplegias, Spastic,Spastic Quadriplegias,Spastic Tetraplegias,Tetraplegia, Flaccid,Tetraplegia, Spastic,Tetraplegias,Tetraplegias, Flaccid,Tetraplegias, Spastic
D011899	Ranitidine	A non-imidazole blocker of those histamine receptors that mediate gastric secretion (H2 receptors). It is used to treat gastrointestinal ulcers.	AH-19065,Biotidin,N (2-(((5-((Dimethylamino)methyl)-2-furanyl)methyl)thio)ethyl)-N'-methyl-2-nitro-1,1-ethenediamine,Ranisen,Ranitidin,Ranitidine Hydrochloride,Sostril,Zantac,Zantic,AH 19065,AH19065,Hydrochloride, Ranitidine
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328	Adult	A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available.	Adults
D013276	Stomach Ulcer	Ulceration of the GASTRIC MUCOSA due to contact with GASTRIC JUICE. It is often associated with HELICOBACTER PYLORI infection or consumption of nonsteroidal anti-inflammatory drugs (NSAIDS).	Gastric Ulcer,Gastric Ulcers,Stomach Ulcers,Ulcer, Gastric,Ulcer, Stomach,Ulcers, Gastric,Ulcers, Stomach
D013312	Stress, Physiological	The unfavorable effect of environmental factors (stressors) on the physiological functions of an organism. Prolonged unresolved physiological stress can affect HOMEOSTASIS of the organism, and may lead to damaging or pathological conditions.	Biotic Stress,Metabolic Stress,Physiological Stress,Abiotic Stress,Abiotic Stress Reaction,Abiotic Stress Response,Biological Stress,Metabolic Stress Response,Physiological Stress Reaction,Physiological Stress Reactivity,Physiological Stress Response,Abiotic Stress Reactions,Abiotic Stress Responses,Abiotic Stresses,Biological Stresses,Biotic Stresses,Metabolic Stress Responses,Metabolic Stresses,Physiological Stress Reactions,Physiological Stress Responses,Physiological Stresses,Reaction, Abiotic Stress,Reactions, Abiotic Stress,Response, Abiotic Stress,Response, Metabolic Stress,Stress Reaction, Physiological,Stress Response, Metabolic,Stress Response, Physiological,Stress, Abiotic,Stress, Biological,Stress, Biotic,Stress, Metabolic