Ethanol increases the risk of epileptic seizures.
Ethionamide increases the risk of side effects from the central nervous system, especially convulsive syndrome.
Isoniazid increases the incidence of dizziness, drowsiness, and negative effects from the nervous system.
With simultaneous use with protionamide, the risk of neurotoxicity increases. With simultaneous application with indirect anticoagulants, the effect of these drugs is enhanced.
With simultaneous use with phenytoin, an increase in the concentration of phenytoin in the blood plasma (risk of toxicity) is possible.
With the simultaneous use of suxamethonium chloride, its miorelaxing effect may be enhanced.