The effects of nefopam on blood acid-base status in the rabbit: interactions with morphine in the mouse and rabbit
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The Journal of Pharmacy and Pharmacology
|October 1, 1980
Abstract:
Nefopam, a non-narcotic analgesic, had only minor effects upon the blood pH, PCO2 and standard bicarbonate of the conscious rabbit. In contrast morphine caused a dose-dependent increase in PCO2 and standard bicarbonate. When nefopam was administered in conjunction with morphine (2.5 mg kg-1 and 1 mg kg-1 i.v. respectively) the increase in PCO2 was greater than with morphine alone. Nefopam also increased the antinociceptive and respiratory frequency depressant effects of morphine in the mouse.
Insights
Nefopam, a non-narcotic analgesic, minimally affected blood gases in rabbits. However, when combined with morphine, nefopam amplified morphine
Area of Science:
- Pharmacology
- Neuroscience
- Analgesic Research
Background:
- Nefopam is a non-narcotic analgesic with a distinct mechanism of action.
- Morphine, a potent opioid analgesic, is known to affect respiratory function and blood gas levels.
- Understanding drug interactions is crucial for safe and effective pain management.
Purpose of the Study:
- To investigate the effects of nefopam on blood gas parameters (pH, PCO2, standard bicarbonate) in conscious rabbits.
- To evaluate the influence of co-administering nefopam with morphine on these physiological parameters.
- To assess the impact of nefopam on morphine's antinociceptive and respiratory depressant effects in mice.
Main Methods:
- Administration of nefopam and/or morphine to conscious rabbits.
- Measurement of blood pH, PCO2, and standard bicarbonate levels.
- Administration of nefopam and morphine to mice to assess antinociception and respiratory frequency.
Main Results:
- Nefopam alone exhibited minor effects on rabbit blood pH, PCO2, and standard bicarbonate.
- Morphine caused a dose-dependent increase in PCO2 and standard bicarbonate in rabbits.
- Co-administration of nefopam with morphine resulted in a greater increase in PCO2 compared to morphine alone.
- Nefopam potentiated the antinociceptive and respiratory depressant effects of morphine in mice.
Conclusions:
- Nefopam has minimal direct impact on blood gas homeostasis in rabbits.
- Nefopam can potentiate the respiratory depressant and analgesic effects of morphine.
- This interaction suggests a potential for enhanced adverse effects when nefopam is combined with morphine, particularly concerning respiratory function.