Beta-blockers and cimetidine increase the risk of toxic effects.
Reduces the cardiotonic effect of digitoxin.
It enhances the muscle relaxation of curare-like drugs.
Aymalin, amiodarone, verapamil and quinidine increase the negative inotropic effect. Inducers of microsomal liver enzymes (barbiturates, phenytoin, rifampicin) reduce the effectiveness of lidocaine.
Vasoconstrictors (epinephrine, methoxamine, phenylephrine) lengthen the local anesthetic effect of lidocaine and can cause an increase in blood pressure and tachycardia.
Lidocaine reduces the effect of antimiasthenic drugs.
Co-administration with procainamide can cause excitation of the central nervous system, hallucinations.
Guanadrel, guanethidine, mecamylamine, trimetaphan increase the risk of pronounced reduction in blood pressure and bradycardia. Strengthens and prolongs the action of muscle relaxants.
The combined use of lidocaine and phenytoin should be used with caution, since it is possible to reduce the resorptive action of lidocaine, as well as the development of an undesirable cardiodepressant effect.
Under the influence of monoamine oxidase inhibitors, it is likely that local anesthetic action of lidocaine is enhanced and blood pressure is lowered. Patients taking monoamine oxidase inhibitors should not be prescribed lidocaine parenterally.
With the simultaneous administration of lidocaine and polymiokisin B, it is necessary to monitor the function of the patient's breathing.
With the combined use of lidocaine with hypnotics or sedatives, narcotic analgesics, hexenal or thiopental sodium, it is possible to intensify the inhibitory effect on the central nervous system and respiration.
When intravenous lidocaine is administered to patients receiving cimetidine, such undesirable effects as stunnedness, drowsiness, bradycardia, paresthesia, etc. are possible. This is due to the increase in lidocaine in the blood plasma, which is explained by the release of lidocaine from the connection with blood proteins, as well as the slowing of its inactivation in the liver. If the need for combined therapy with these drugs should reduce the dose of lidocaine.
When treating the injection site with disinfectant solutions containing heavy metals, the risk of developing a local reaction in the form of tenderness and swelling increases.