फेनोबार्बिटोन, हायोसायमिन, एट्रोपिन और स्कोपोलामाइन (हायोसिन) और टियागाबिन का इंटरैक्शन

…tiagabine HCl dosing recommendations in current labeling for treatment of epilepsy were based on use in patients with partial seizures 12 years of age and older, most of whom were taking enzyme-inducing antiepileptic drugs (AEDs; e.g., carbamazepine, phenytoin, primidone and phenobarbital) which lower plasma levels of tiagabine HCl by inducing its metabolism.

Carbamazepine, phenytoin, primidone, and phenobarbital are generally classified as enzyme inducers; valproate and gabapentin are not.

Phenobarbital or Primidone : No formal pharmacokinetic studies have been performed examining the addition of tiagabine to regimens containing phenobarbital or primidone.

The addition of tiagabine in a limited number of patients in three well-controlled studies caused no systematic changes in phenobarbital or primidone concentrations when compared to placebo.

Phenobarbital (Primidone) : Population pharmacokinetic analyses indicate that tiagabine clearance is 60% greater in patients taking phenobarbital (primidone) with or without other enzyme-inducing AEDs.