Comparative Pharmacology
Head-to-head clinical analysis: GABAPENTIN ENACARBIL versus MYSOLINE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: GABAPENTIN ENACARBIL versus MYSOLINE.
GABAPENTIN ENACARBIL vs MYSOLINE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Gabapentin enacarbil is a prodrug of gabapentin. It binds to the α2δ subunit of voltage-gated calcium channels, inhibiting calcium influx and reducing release of excitatory neurotransmitters such as glutamate, norepinephrine, and substance P. This modulates neuronal excitability and pain transmission.
Primidone is a barbiturate anticonvulsant that acts by enhancing GABA-A receptor activity and possibly by blocking sodium channels.
Initial: 600 mg orally once daily; titrate to 600 mg three times daily; max 2400 mg/day divided three times daily.
250 mg orally 3 times daily; may increase by 250 mg/day every 3 days; usual maintenance 250 mg 3-4 times daily; maximum daily dose 1500 mg.
None Documented
None Documented
Clinical Note
moderateGabapentin enacarbil + Venlafaxine
"The risk or severity of adverse effects can be increased when Gabapentin enacarbil is combined with Venlafaxine."
Clinical Note
moderateGabapentin enacarbil + Nefazodone
"The risk or severity of adverse effects can be increased when Gabapentin enacarbil is combined with Nefazodone."
Clinical Note
moderateGabapentin enacarbil + Stiripentol
"The risk or severity of adverse effects can be increased when Gabapentin enacarbil is combined with Stiripentol."
Clinical Note
moderateTerminal half-life of gabapentin: 5–7 hours in patients with normal renal function. Renal impairment prolongs half-life proportionally to creatinine clearance decline.
Primidone: 5-15 hours (mean 10 hours); PEMA: 10-18 hours; Phenobarbital: 50-120 hours. Steady state achieved in 2-4 weeks due to accumulation of phenobarbital.
Renal: 100% as unchanged gabapentin (prodrug is rapidly hydrolyzed to gabapentin after absorption). No biliary or fecal elimination of active drug.
Primidone is excreted primarily in urine; approximately 60-80% as unchanged drug and metabolites (PEMA, phenobarbital), with less than 10% in feces.
Category A/B
Category C
Anticonvulsant
Anticonvulsant
Gabapentin enacarbil + Pomalidomide
"The risk or severity of adverse effects can be increased when Gabapentin enacarbil is combined with Pomalidomide."