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GPhC Pre-Reg Exam Preparation Specialists
The central nervous system is one of four high-rated therapeutic areas in the GPhC exam which covers a wide range of topics. Some of the main subsections are: hypnotics and sedatives (i.e. Midazolam, Lorazepam), antidepressants (i.e. Clomipramine, Citalopram), antipsychotics (i.e. Haloperidol), analgesics (i.e. Fentanyl, Gabapentin), antiepileptics (i.e. Lamotrigine), and drugs used in parkinsonism (i.e. Memantine, Procyclidine).
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ANTIMANIC: LITHIUM | |||
Drug action | What is it used for? | Cautions | Signs of toxicity |
· Reduces pre-synaptic dopamine activity thus, inhibits excitatory neurotransmission | · Treatment and prophylaxis of mania, bipolar disorder, recurrent depression, aggressive or self-harming behaviour | · Avoid abrupt withdrawal · Cardiac disease · Diuretic treatment · Myasthenia gravis · Psoriasis · QT interval prolongation | · Increasing gastro-intestinal disturbances · Visual disturbances · Polyuria · Muscle weakness, tremor, abnormal reflexes · Confusion, drowsiness, lack of coordination · Hypernatraemia |
ANTIEPILEPTIC: CARBAMAZEPINE | ||||
Drug action | What is it used for? | Cautions | (Very) common side effects | |
· Inhibits sodium channel firing (this drug is a sodium channel blocker as it binds to inactivated sodium channels) | · Tonic-clonic seizures · Trigeminal neuralgia · Prophylaxis of bipolar disorder unresponsive to lithium · Acute alcohol withdrawal · Diabetic neuropathy | · Cardiac disease · Blood, hepatic, skin disorders · Angle-closure glaucoma | · Dizziness, drowsiness, headache · Dry mouth · Eosinophilia, leucopenia, thrombocytopenia · Fatigue · Gastrointestinal discomfort, nausea, vomiting · Hyponatraemia · Movement disorders · Oedema · Skin reactions · Vision disorders · Weight gain |
Cpss = 3mg/L τ = 12hrs F = 1 S = 0.5 |
Written by Fatima Sazzad, GPhC Reg No. 2212805