Save up -80% on Acetaminophen
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2018 Price of Acetaminophen
* price without discount in nearest pharmacy. Price may vary.
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Acetaminophen volume of distribution
Discount Cards 16,000+
Clients Benefit 29%
Total savings $4,735,080
What is Acetaminophen
Acetaminophen, also known as paracetamol, is commonly used for its analgesic and antipyretic effects. Its therapeutic effects are similar to salicylates, but it lacks anti-inflammatory, antiplatelet, and gastric ulcerative effects.
Acetaminophen mechanism of action
Acetaminophen is thought to act primarily in the CNS, increasing the pain threshold by inhibiting both isoforms of cyclooxygenase, COX-1, COX-2, and COX-3 enzymes involved in prostaglandin (PG) synthesis. Unlike NSAIDs, acetaminophen does not inhibit cyclooxygenase in peripheral tissues and, thus, has no peripheral anti-inflammatory affects. While aspirin acts as an irreversible inhibitor of COX and directly blocks the enzyme’s active site, studies have found that acetaminophen indirectly blocks COX, and that this blockade is ineffective in the presence of peroxides. This might explain why acetaminophen is effective in the central nervous system and in endothelial cells but not in platelets and immune cells which have high levels of peroxides. Studies also report data suggesting that acetaminophen selectively blocks a variant of the COX enzyme that is different from the known variants COX-1 and COX-2. This enzyme is now referred to as COX-3. Its exact mechanism of action is still poorly understood, but future research may provide further insight into how it works. The antipyretic properties of acetaminophen are likely due to direct effects on the heat-regulating centres of the hypothalamus resulting in peripheral vasodilation, sweating and hence heat dissipation.
Dosage forms of Acetaminophen
|Tylenol Regular||325mg||100 Tablet||$16.76|
|Tylenol Extra Strength||500mg||100 Tablet||$18.61|
|Tylenol Infant Drops||noDose||24mL Drops||$14.90|
|Tylenol Arthritis Pain||650mg||100 Timed Release Caplets||$22.49|
|Tylenol Childrens Suspension Grape||80mg/5mL||100mL Syrup (PMS)||$14.41|
|Tylenol||325mg||96 Tablet (PMS)||$34.20|
|Tylenol Ultra Relief Migrane||500mg/65mg||20 Tablet||$13.20|
|Robaxacet Extra Strength||400/500mg||72 Tablet||$74.40|
|Tempra Drops Banana||80mg/mL||24mL Drops (Banana)||$15.30|
|Tempra Chewable Tablets||80mg||24 Chewable Tablet||$12.30|
|Tempra Syrup Cherry||160mg/5mL||100mL Syrup (Cherry)||$13.42|
Stanley Pharmaceuticals, A Division Of Vita Health Products Inc.
Humans and other mammals
Indication of Acetaminophen
For temporary relief of fever, minor aches, and pains.
Toxicity of Acetaminophen
Oral, mouse: LD50 = 338 mg/kg; Oral, rat: LD50 = 1944 mg/kg. Acetaminophen is metabolized primarily in the liver, where most of it is converted to inactive compounds by conjugation with glucuronic acid and, to a lesser extent, sulfuric acid. Conjugates are then excreted by the kidneys. Only a small portion is excreted in unchanged in urine or oxidized via the hepatic cytochrome P450 enzyme system (CYP2E1). Metabolism via CYP2E1 produces a toxic metabolite, N-acetyl-p-benzoquinoneimine (NAPQI). The toxic effects of acetaminophen are due to NAPQI, not acetaminophen itself nor any of the major metabolites. At therapeutic doses, NAPQI reacts with the sulfhydryl group of glutathione to produce a non-toxic conjugate that is excreted by the kidneys. High doses of acetaminophen may cause glutathione depletion, accumulation of NAPQI and hepatic necrosis. The maximum daily dose of acetaminophen is 4 g. Liver failure has been observed at doses as low as 6 g per day. As such, the maximum daily and single dose of acetaminophen is currently being reviewed in some countries. N-acetyl-cysteine, a precursor of glutathione, may be administered in the event of acetaminophen toxicity.
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