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Uses

Potassium nitrate is a medication used to cauterize small wounds, remove granulation tissue, warts, and verrucae, and treat tooth sensitivity.

For the relief of tooth sensitivity, and is also used as a pesticide, insecticide, as a food additive, and a rodenticide .

Fliz Up is also used to associated treatment for these conditions: Tooth Sensitivity

How Fliz Up works

Potassium (K+) is the principal cation modulating the osmotic balance of the body fluids. In animals, the maintenance of normal cell volume and pressure is dependent on Na+ and K+ pumping . Potassium transport through the hydrophobic interior of a cell membrane may be facilitated by several naturally occurring compounds that form lipid-soluble alkali metal cation complexes. Potassium has the critical role of a calcium counter-ion for numerous carboxylates, phosphates, and sulfates, and also acts to stabilize macromolecular structures .

Potassium is the primary agent for common, over the counter de-sensitizing toothpaste that prevents the transmission of nerve endings to the teeth. Potassium salts, including potassium nitrate, potassium chloride or potassium citrate work by diffusion across the dentinal tubules, causing depolarization of the nerve cells. In turn, these cells become unresponsive to excitatory stimuli. The effect of the potassium nitrate accumulates over time, and it may take several weeks for patients to notice improvement of pain symptoms .

Potassium nitrates control pests using a unique mechanism of action. Rather than directly poisoning rodents, nitrates support the combustion of charcoal in gas cartridges, promoting the production of toxic gases, which, are lethal to the target pest. The environmental protection agency in the USA (EPA) is only minimally concerned about the risk of direct human exposure to sodium or potassium nitrates, rather than pesticide accidents--typically involving skin burns or inhalation of toxic gases .

Toxicity

Acute oral toxicity (LD50): 1901 mg/kg in rabbits and 3750 mg/kg in rats .

The primary acute toxic effect of nitrates is the development of methemoglobinemia, a condition in which greater than 10% of the hemoglobin in the body is transformed into methemoglobin. When this conversion exceeds 70% the condition may result in death .

The potassium ion by itself possesses very little toxicity; the toxicity of the salts is associated with the anion. Potassium nitrate is rapidly absorbed from the upper gastrointestinal tract and is excreted mostly as the unchanged drug . This excludes a small percentage of the ingested dose that is reduced by the microbial action of the gut to nitrite. Nitrites convert the hemoglobin in red blood cells into methemoglobin . In male rats given potassium nitrate, intestinal absorption was affected .

Adverse increased potassium intake included changes in blood lipids, triglyceride, decreased high-density lipoprotein [HDL] cholesterol), changes in renal function, and increases in catecholamine levels. The decrease in blood volume caused by increased potassium activates the sympathetic nervous system, resulting in the release of adrenaline and noradrenaline. Decreases in blood volume may also contribute to the observed changes in blood lipid concentrations .

Death and severe effects of nitrate ingestion are generally associated with doses of the drugs above 10g NO3-. Doses ranging from 2-9 g NO3- have been reported to cause methemoglobinemia. These values correspond to 33 - 150 mg NO3-/kg Potassium nitrate was shown to cause low to moderate acute toxicity. Repeated dose toxicity was investigated in rats given oral doses in the range 10-100 mg/kg per day for 4 months; bronchopneumonia, local hemorrhages, and other circulatory disorders were observed in treated animals. Cattle were given oral doses of 345-450 mg/kg daily (expressed as nitrate) for several months; blood phosphate and magnesium were decreased and blood calcium, urinary magnesium, urea and milk urea were increased .

Volume of Distribution

Nitrates are absorbed into the general blood circulation and are transported across the body. Radioactive tracer experiments have demonstrated that nitrates are distributed evenly among body organs, and their rate of distribution depends on blood flow .

Elimination Route

It is established that nitrate is quickly and almost entirely absorbed from the proximal and small intestine subsequent to ingestion in most animals, with little if any absorption from the stomach and lower intestine .

The vast majority of intestinal K+ absorption occurs in the small intestine; the contribution of the normal colon to net K+ absorption and secretion is trivial .

Elimination Route

Nitrates are excreted in the urine primarily as inorganic nitrates .

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