Cyclobenzaprine hydrochloride

Cyclobenzaprine is a skeletal muscle relaxant that also has sedative properties. It has been shown to antagonize muscarinic receptors (K_is = 25, 60, and 6 nM for M₁, M₂, and M₃, respectively), serotonin 5-HT₂ receptors (K_is = 56 and 330 nM for 5-HT_2C and 5-HT_2B, respectively), and histamine H₁ receptor (IC₅₀ = 20 nM).

Crystalline Solid

Flexeril,Merck Sharp andDohme,US,1977

Cyclobenzaprine hydrochloride has been used to study its effect on the muscles of dystrophin-deficient mdx5Cv mice.

Cyclobenzaprine hydrochloride can be used as a serotonin receptor inhibitor.

Cyclobenzaprine hydrochloride cam be used as muscle relaxant (skeletal).

ChEBI: The hydrochloride salt of cyclobenzaprine. A centrally acting skeletal muscle relaxant, it is used in the symptomatic treatment of painful muscle spasm.

In an initial step, dibenzo [a,d]cyclohepten-5-one is reacted with the Grignardreagent of 3-dimethylaminopropyl chloride and hydrolyzed to give 5-(3-dimethylaminopropyl)-dibenzo[a,d][1,4]cycloheptatriene-5-ol. Then 13 g ofthat material, 40 ml of hydrochloric acid, and 135 ml of glacial acetic acid isrefluxed for 3 hours. The solution is then evaporated to dryness in vacuoand added to ice water which is then rendered basic by addition of ammoniumhydroxide solution. Extraction of the basic solution with chloroform andremoval of the solvent from the dried chloroform extracts yields the crudeproduct which when distilled in vacuo yields essentially pure 5-(3-dimethylaminopropylidene)-dibenzo[a,d][1,4]cycloheptatriene, BP 173°C to177°C at 1.0 mm.

Flexeril (McNeil).

Muscle relaxant

Cyclobenzaprine is a tricyclic agent, which has anti-depressant and anti-cholinergic properties. It lowers the tonic somatic motor activity of motor neuron systems. Cyclobenzaprine prevents the uptake ofnoradrenaline. It is used to treat neck,back and myofascial pain. Cyclobenzaprine functions as a nerve impulse inhibitor.

[1]. honda m, nishida t, ono h. tricyclic analogs cyclobenzaprine, amitriptyline and cyproheptadine inhibit the spinal reflex transmission through 5-ht2 receptors. european journal of pharmacology, 2003, 458(1): 91-99.
[2]. barnes c d, fung s j, gintautas j. brainstem noradrenergic system depression by cyclobenzaprine. neuropharmacology, 1980, 19(2): 221-224.
[3]. leysen j e. 5-ht2 receptors. current drug targets-cns & neurological disorders, 2004, 3(1): 11-26.