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If it is 1g twice daily then doesn't that mean 2g a day? Therefore 50% of 2g is 1g. Please correct me if I have missed something.
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as each dose is 1g - you halve each dose - so it becomes 500mg in the morning and then 500mg in the evening. So the total daily dose will be 1g 
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Acute Myotonia
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Cremaster Reflex
Concept
Chapter
#### Monitoring

The BNF advises to monitor lung function (in patients with a history of obstructive airway disease).

#### Overdoses

Overdosages with beta-blockers may cause cardiac effects such as bradycardia, hypotension, syncope, conduction abnormalities, and heart failure. Bradycardia is the most common arrhythmia, but some beta-blockers may induce ventricular tachyarrhythmias secondary to prolongation of QT interval (e.g. sotalol) or QRS duration (e.g. propranolol).
Non-cardiovascular effects include central nervous system effects (including drowsiness, confusion, convulsions, hallucinations, and in severe cases coma), respiratory depression, and bronchospasm.

Management
 - Airway protection 
 - Activated charcoal within 1 hour
 - IV Fluids
 
IV glucagon is the first-line management.
 
For symptomatic bradycardia, IV atropine may be used.

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Calculation of infusion rate
Topic
90
Psychiatry
After adjusting for renal impairment, the dose to be given is: 50% x 1g = 500mg.
Hence, the rate at which levetiracetam is to be given is: 500mg ÷ 15 minutes = 33.3ml/min ≈ 33mL/min.
The volume of 0.9% sodium chloride solution required for dilution is a distraction.
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33
mg/min
A 47-year-old patient with focal seizures was initially prescribed levetiracetam (Keppra(R)) at a maintenance dose of 1g twice daily. Due to co-existing renal impairment, it has been decided that the dose should be reduced by 50% as per the manufacturer's advice. This is diluted in 100mL of 0.9% sodium chloride solution and given over 15 minutes.


What is the rate (in mg per minute) of levetiracetam he is to be given at each dose? Round off your answer to the nearest mg per minute.