Pifnim Mr

Pifnim Mr Uses, Dosage, Side Effects, Food Interaction and all others data.

A centrally acting central muscle relaxant with sedative properties. It is claimed to inhibit muscle spasm by exerting an effect primarily at the level of the spinal cord and subcortical areas of the brain. (From Martindale, The Extra Pharmacopoea, 30th ed, p1202)

Chlorzoxazone is a centrally-acting agent for painful musculoskeletal conditions. Data available from animal experiments as well as human study indicate that chlorzoxazone acts primarily at the level of the spinal cord and subcortical areas of the brain where it inhibits multisynaptic reflex a.c. involved in producing and maintaining skeletal muscle spasm of varied etiology. The clinical result is a reduction of the skeletal muscle spasm with relief of pain and increased mobility of the involved muscles.

Nimesulide is a nonsteroidal anti-inflammatory drug (NSAID) with anti-inflammatory, anti-pyretic, and analgesic properties. It inhibits prostaglandin synthetase/cyclooxygenase, which limits prostaglandin production. Its cyclooxygenase inhibiting potency is intermediate, but is relatively selective for the cyclo-oxygenase-2 (COX-2) thus the potential for gastric injury and intolerance is less. It is also a free radical scavenger, and helps protect against the tissue damage that occurs during inflammation.

Food, gender and advanced age have negligible effects on nimesulide pharmacokinetics.

Pifnim Mr
Uses
Dosage
Side Effect
Precautions
Interactions
Uses during Pregnancy
Uses during Breastfeeding
Accute Overdose
Food Interaction
Half Life
Volume of Distribution
Clearance
Interaction With other Medicine
Contradiction
Storage

Trade Name	Pifnim Mr
Generic	Chlorzoxazone + Nimesulide
Type	Tablet
Therapeutic Class
Manufacturer	Pifer Pharmaceuticals Pvt Ltd
Available Country	India
Last Updated:	September 19, 2023 at 7:00 am

Uses

Chlorzoxazone is a drug with muscle relaxant properties that is used as an adjunct to physical therapy and analgesics to treat stiffness and pain caused by a variety of musculoskeletal conditions.

For the relief of discomfort associated with acute painful musculoskeletal conditions.

Nimesulide is used for acute pain; extra-articular disorders; osteoarthritis; post-op pain; primary dysmenorrhoea

Pifnim Mr is also used to associated treatment for these conditions: Pain, Moderate Muscle Spasm, Severe Muscle SpasmMenstrual Distress (Dysmenorrhea), Pain, Pain, Acute, NSAIDs

How Pifnim Mr works

Chlorzoxazone inhibits degranulation of mast cells, subsequently preventing the release of histamine and slow-reacting substance of anaphylaxis (SRS-A), mediators of type I allergic reactions. Chlorzoxazone also may reduce the release of inflammatory leukotrienes. Chlorzoxazone may act by inhibiting calcium and potassium influx which would lead to neuronal inhibition and muscle relaxation. Data available from animal experiments as well as human study indicate that chlorzoxazone acts primarily at the level of the spinal cord and subcortical areas of the brain where it inhibits multisynaptic reflex arcs involved in producing and maintaining skeletal muscle spasm

The therapeutic effects of Nimesulide are the result of its complete mode of action which targets a number of key mediators of the inflammatory process such as: COX-2 mediated prostaglandins, free radicals, proteolytic enzymes and histamine.

Dosage

Pifnim Mr dosage

100 mg twice daily.Should be taken with food. Take after meals.

Side Effects

Epigastric discomfort, heartburn or abdominal cramps, nausea, vomiting and diarrhoea; skin rash, pruritus, oedema, headache, dizziness, drowsiness; hypersensitivity reactions (e.g. bronchospasm, rhinitis, angioedema urticaria); GI haemorrhage/perforation; bullous/erosive stomatitis, purpura, thrombocytopenia, toxic epidermal necrolysis, haematuria, oliguria, and renal failure; increases in liver enzymes.

Toxicity

Oral, mouse: LD₅₀ = 440 mg/kg; Oral, rat: LD₅₀ = 763 mg/kg; Symptoms of overdose include diarrhea, dizziness, drowsiness, headache, light-headedness, nausea, and vomiting.

Oral TDLO (human): 1.429 mg/kg; Oral TDLO (woman): 2 mg/kg; Oral LD50 (rat): 200 mg/kg; Oral LD50 (mouse): 392 mg/kg

Precaution

History of GI tract disease, infections, oedema, hypertension, elderly, lactation.

Interaction

Additive hepatotoxic effects with known hepatotoxins: anti-convulsants (e.g. valproic acid), anti-fungals (e.g. ketoconazole), anti-tuberculous drugs (e.g. isoniazid), tacrine, pemoline, amiodarone, methotrexate, methyldopa, amoxicillin/clavulanic acid. May decrease the oral bioavailability of furosemide and the natriuretic and diuretic response to furosemide. Increased risks of GI and hepatic adverse effects with other NSAIDs, including aspirin. May increase anti-coagulant effect of warfarin. Potentiates the action of phenytoin. May be displaced from binding sites with fenofibrate, salicylic acid, and tolbutamide. Interactions between NSAIDs and lithium, probenecid and ciclosporin, have been documented.

Elimination Route

Rapidly absorbed following oral administration.

Half Life

1.8–4.7 hours

Elimination Route

Chlorzoxazone is rapidly metabolized and is excreted in the urine, primarily in a conjugated form as the glucuronide.

Renal (50%), fecal (29%)

Pregnancy & Breastfeeding use

Category not classified

Contraindication

Hypersensitivity; GI bleeding, active peptic ulcer disease; severe renal and heart failure; hepatic impairment or known liver disease; coagulation disorders; pregnancy; children <12 yr.

Acute Overdose

Epigastric pain, nausea, vomiting, drowsiness, lethargy, GI haemorrhage, seizures, hypertension, apnoea, coma, anaphylactic reactions and renal failure. Treatment is supportive.