Indian journal of physiology and pharmacology
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Indian J. Physiol. Pharmacol. · Apr 2002
Comparative StudyEvaluation of analgesic, antipyretic and anti-inflammatory activity of spirobarbitunylphenothiazines in rodents.
Analgesic, antipyretic and anti-inflammatory activities of newly synthesized spirobarbitunylphenothiazines viz 10-[7, 11-Di(4-4' dimethoxphenyl)-3-oxo-9-methylaminoimino-2, 4-diazaspiro [5.5] undecane 1, 5 dione] acetylphenothiazine (test drug A) and 10-[7, 11-Di (N. N-dimethylaminophenyl)-3-oxo-9-methylaminoimino-2, 4-diazaspiro [5, 5] undecane-1, 5 dione] acetylphenothiazine (test drug B) have been screened in Swiss mice and Wistar rats. The peripheral analgesic activity of test drugs A and B was investigated by acetic acid induced writhing test in Swiss mice while the central analgesic action was assessed by hot-wire (tail flick test) of the analgesiometer and tail-clip test in Wistar rats. ⋯ Analgesic activity was found to be only of peripheral type as there was reduction of 66% in writhing responses by test drugs A and B in dose of 80 mg/kg in mice. No change in the tail flick responses was observed on analgesiometer or by tail clip by both the test drugs. Reduction of 1.5 to 2.0 degrees C in rectal temperature was observed in pyretic rats by test drugs A and B in dose of 80 mg/kg. 80% reduction in paw volume was noted in 80 mg/kg dose of both the test drugs which was comparable to the anti-inflammatory activity of 300 mg/kg, p.o. of phenylbutazone.
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To evaluate the involvement of Ca++ channels in Gabapentin antinociception. In healthy male albino rats formalin (50 microliters, 5%) was injected at the planter surface of the paw. Pain score was calculated. ⋯ Gabapentin (30 mg/kg) and nifedipine (10 mg/kg) reduced the pain score in formalin injected rats. Gabapentin (10 mg/kg) and nifedipine (3 mg/kg) given alone did not modify pain score, however, on co-administration they significantly reduced the pain score. Study provides evidence of involvement of Ca++ channels in gabapentin antinociception.