Enzyme Inducers - Carbamazepine Flashcards
Dr. Aderemi
Carbamazepine is a _______ derivative used as a prophylactic in chronic epilepsy therapy.
Iminostilbene
It is also used to treat _________________ and ____________.
Trigeminal neuralgia and bipolar affective disorder
At standard dose, CBZ may cause convulsion and CNS toxicity.
True or False?
True
The therapeutic range for carbamazepine is _______.
4-12μg/mL
At ________, patients may experience concentration-related adverse effects.
> 8μg/mL
Mention 7 concentration-related adverse effects of CBZ.
i. Nausea
ii. Vomiting
iii. Lethargy
iv. Headache
v. Diplopia
vi. Blurred vision
vii. Ataxia
viii. Incoordination
Concentration-related toxicity of CBZ may manifest as ________
Osteoporosis
Blood dyscrasias, such as aplastic anaemia and agranulocytosis.
CBZ treatment is discontinued when WBC is ________ and ANC is _________.
WBC<2500/mm3
ANC<1000/mm3
ANC is Absolute Neutrophil Count
CBZ causes AED hypersensitivity syndrome and cross-reactivity with other aromatic anticonvulsants such as ___________, ___________, __________ and other drugs that cause AED hypersensitivity syndrome.
Oxcarbazepine
Phenobarbital
Phenytoin
There are injectable CBZ preparations.
True or False.
False.
There is no injectable CBZ
List the available oral dosage forms of CBZ.
- Immediate-release tablet (regular: 100mg, 200mg, 300mg and chewable: 100mg)
- Sustained-release tablet (100mg, 200mg and 400mg)
- Sustained-release capsules (100mg, 200mg and 300mg)
- Suspension 100mg/5ml
Answer with True or False:
i. CBZ is an auto-inducer
ii. Its adverse effects can be seen early in dosage titration, soon after an dosage increase.
i. True
ii. True
Absorption 0f CBZ is rapid and Tmax depends on ________.
The dosage form
Provide the values for the following CBZ pharmacokinetic parameters.
Bioavailability =
Vd =
Plasma Protein binding =
Free unbound drug =
Bioavailability = 75-85%
Vd = 0.8-2.0L/kg
Plasma Protein binding = 75-80%
Free unbound drug = 20-25%
In the plasma, CBZ binds to albumin and ________
α1-acid glycoprotein (AGP)