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Price of Vitamin A
Vitamin a acetate crystals
* price without discount in nearest pharmacy. Price may vary.
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Vitamin A volume of distribution
What is Vitamin A
Retinol and derivatives of retinol that play an essential role in metabolic functioning of the retina, the growth of and differentiation of epithelial tissue, the growth of bone, reproduction, and the immune response. Dietary vitamin A is derived from a variety of carotenoids found in plants. It is enriched in the liver, egg yolks, and the fat component of dairy products. (PubChem)
Vitamin A mechanism of action
Vision:Vitamin A (all- i trans /i retinol) is converted in the retina to the 11- i cis /i -isomer of retinaldehyde or 11- i cis /i -retinal. 11- i cis /i -retinal functions in the retina in the transduction of light into the neural signals necessary for vision. 11- i cis /i -retinal, while attached to opsin in rhodopsin is isomerized to all- i trans /i -retinal by light. This is the event that triggers the nerve impulse to the brain which allows for the perception of light. All- i trans /i -retinal is then released from opsin and reduced to all- i trans /i -retinol. All- i trans /i -retinol is isomerized to 11- i cis /i -retinol in the dark, and then oxidized to 11- i cis /i -retinal. 11- i cis /i -retinal recombines with opsin to re-form rhodopsin. Night blindness or defective vision at low illumination results from a failure to re-synthesize 11- i cis /i retinal rapidly. br/ Epithelial differentiation: The role of Vitamin A in epithelial differentiation, as well as in other physiological processes, involves the binding of Vitamin A to two families of nuclear retinoid receptors (retinoic acid receptors, RARs; and retinoid-X receptors, RXRs). These receptors function as ligand-activated transcription factors that modulate gene transcription. When there is not enough Vitamin A to bind these receptors, natural cell differentiation and growth are interrupted.
Dosage forms of Vitamin A
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400 Vitamin A 10000iu
Herbes Universelles Inc.
Humans and other mammals
Indication of Vitamin A
For the treatment of vitamin A deficiency.
Toxicity of Vitamin A
Acute toxicity (single ingestion of 7 500 RE or 25 000 IU per kg or more): Signs and symptoms may be delayed for 8 to 24 hours and include: increased intracranial pressure, headache, irritability, drowsiness, dizziness, lethargy, vomiting, diarrhea, bulging of fontanels in infants, diplopia, papilledema. Peeling of skin around mouth may be observed from 1 to several days after ingestion and may spread to the rest of the body.
Chronic, excessive ingestion (1 200 RE or 4 000 IU/kg daily for 6 to 15 months) may produce symptoms of pseudotumor cerebri, anorexia, weakness, arthralgias, bone pain, bone demineralization, dry skin, cracked lips, brittle nails, hair loss, splenomegaly, hepatomegaly, hypoplastic anemia, leukopenia, optic neuropathy, and blindness. Increased plasma concentrations of vitamin A occur but do not necessarily correlate with toxicity.
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