"Repeated subcutaneous injections of botulinum toxin A (Botox, Allergan) provides analgesic relief to patients with neuropathic pain, a new randomized controlled trial has shown.
The study showed that two series of injections "...
The major hazards of meperidine, as with other narcotic analgesics, are respiratory depression and, to a lesser degree, circulatory depression; respiratory arrest, shock, and cardiac arrest have occurred.
The most frequently observed adverse reactions include lightheadedness, dizziness, sedation, nausea, vomiting, and sweating. These effects seem to be more prominent in ambulatory patients and in those who are not experiencing severe pain. In such individuals, lower doses are advisable. Some adverse reactions in ambulatory patients may be alleviated if the patient lies down.
Other adverse reactions include
Nervous System. Mood changes (e.g. euphoria, dysphoria), weakness, headache, agitation, tremor, involuntary muscle movements (e.g. muscle twitches, myoclonus), severe convulsions, transient hallucinations and disorientation, confusion, delirium, visual disturbances. Inadvertent injection about a nerve trunk may result in sensory-motor paralysis which is usually, though not always, transitory.
Genitourinary. Urinary retention.
Allergic. Pruritus, urticaria, other skin rashes, wheal and flare over the vein with intravenous injection.
Hypersensitivity reactions, anaphylaxis.
Histamine release leading to hypotension and/or tachycardia, flushing, sweating, and pruritus.
Other. Pain at injection site; local tissue irritation and induration following subcutaneous injection, particularly when repeated; antidiuretic effect.
Read the Demerol (meperidine) Side Effects Center for a complete guide to possible side effects
Also see WARNINGS
Acyclovir: Plasma concentrations of meperidine and its metabolite, normeperidine, may be increased by acyclovir, thus caution should be used with concomitant administration.
Cimetidine: Cimetidine reduced the clearance and volume of distribution of meperidine and also the formation of the metabolite, normeperidine, in healthy subjects and thus, caution should be used with concomitant administration.
CNS Depressants: Concomitant use of CNS depressants with usual doses of Demerol™ may result in respiratory depression, hypotension, profound sedation, coma or death (see PRECAUTIONS, Interactions with other CNS Depressants ).
Phenytoin: The hepatic metabolism of meperidine may be enhanced by phenytoin. Concomitant administration resulted in reduced half-life and bioavailability with increased clearance of meperidine in healthy subjects, however, blood concentrations of normeperidine were increased, thus exercise caution when phenytoin is used concomitantly with meperidine.
Ritonavir: Plasma concentrations of the active metabolite normeperidine may be increased by ritonavir, thus concomitant administration should be avoided.
Opioid analgesics, including Demerol™, may enhance the neuromuscular blocking action of skeletal muscle relaxants and produce an increased degree of respiratory depression.
Special Risk Patients
Meperidine should be given with caution and the initial dose should be reduced in certain patients such as the elderly or debilitated, and those with severe impairment of hepatic or renal function, sickle cell anemia, hypothyroidism, Addison's disease, pheochromocytoma and prostatic hypertrophy or urethral stricture. In patients with pheochromocytoma, meperidine has been reported to provoke hypertension.
Usage In Hepatically Impaired Patients
Accumulation of meperidine and/or its active metabolite, normeperidine, can occur in patients with hepatic impairment. Meperidine should therefore be used with caution in patients with hepatic impairment.
Usage In Renally Impaired Patients
Accumulation of meperidine and/or its active metabolite, normeperidine, can also occur in patients with renal impairment. Meperidine should therefore be used with caution in patients with renal impairment.
Read the Demerol Drug Interactions Center for a complete guide to possible interactions
Last reviewed on RxList: 1/5/2016
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