megavitamin therapy

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megavitamin therapy

[-vī′təmin]
a type of treatment that involves the administration of large doses of certain vitamins and minerals.
The administration of supraphysiologic or in some cases ‘hyper-doses’—up to hundreds of times daily requirement—of vitamins, based on the belief that it will correct an unnamed disorder

megavitamin therapy

The administration of excess or 'hyper-doses' of water-soluble vitamins, either physician-guided–eg, to treat neuropathies, or self-prescribed by health-food advocates. See Decavitamin, Orthomolecular medicine, Vitamin.
Megavitamins, adverse effects  
Thiamin CNS hyperresponsiveness–convulsions, Parkinson's disease–thiamin antagonizes l-dopa, sensory neuropathy–destruction of dorsal axon roots
Niacin/nicotinic acid & niacinamide/nicotinamide Exacerbation of asthma–histamine release, cardiac disease–arrhythmias, GI symptoms, eg nausea, vomiting, diarrhea, anorexia, DM–hyperglycemia, gout–↑ uric acid, liver disease–enzyme leakage, hepatocellular injury, portal fibrosis or massive necrosis, cholestatic jaundice, peptic ulcer disease–histamine release, ↑ acidity, skin disease
Vitamin B6 Paresthesia, headaches, asthenia, irritability
Vitamin C ↑ Iron absorption, possibly iron overload, evoking diarrhea, renal calculus formation and possibly inhibiting the bacteriolytic activity of neutrophils, G6PD deficiency–↑ red cell lysis, megaloblastic anemia–↓ vitamin B12 absorption, nephrolithiasis–oxaluria Diagn Clin Testing 1990; 28:27  

meg·a·vi·ta·min ther·a·py

(meg'ā-vī'tă-min thār'ă-pē)
Large doses of vitamins, minerals, and amino acids that are used as medications to treat physical and psychiatric illnesses.
Synonym(s): orthomolecular medicine.
References in periodicals archive ?
In a survey of 1,038 women undergoing in vitro fertilization and oocyte retrieval, 33% reported having procedures such as acupuncture and relaxation therapy and 18% used herbal remedies, with megavitamins, echinacea, and primrose being the most popular, Dr.
However, the megavitamin revolution that began in the 1930s presented a conceptual challenge to the medical community: megavitamins as drugs, now in competition with pharmaceuticals for the treatment of disease.
Other popular modalities included dietary supplements, megavitamins, and spiritual practices, which were used by between 13% and 15% of respondents.
At the same time that I was being introduced to these natural approaches to treating cardiovascular disease, arthritis, cancer, and inflammatory disorders, I was also introduced to the use of megavitamins and diet for the treatment of mental disorders.
The trend towards megavitamins can be dangerous when it comes to vitamin A," he said.
For example, Eisenberg included megavitamins as a separate category.
Lendon Smith, MD, risked his reputation when he prescribed megavitamins, including vitamin C, for children in his groundbreaking 1979 book Feed Your Kids Right.
In a somewhat similar manner, an increasing number of women are taking megavitamins as part of their lifestyle, with the belief that "more is better.