What is the rule for breakthrough opioid dosing?
1/6 of the total 24-hr opioid dose.
How do you convert oral to IV morphine?
Divide oral dose by 2.
What is the daily adult maintenance fluid requirement?
25–30 mL/kg/day water
+ 1 mmol/kg/day Na⁺, K⁺, Cl⁻
+ 50–100 g glucose.
What fluids are used for initial resuscitation?
500 mL 0.9% NaCl over <15 min.
Morphine (opioid-naïve) oral starting dose?
5–10 mg PO 4-hourly.
Morphine IV/SC starting dose (opioid-naïve)?
2.5–5 mg IV/SC every 4 hrs.
Enoxaparin prophylactic dose (normal renal function)?
40 mg SC OD.
Warfarin INR target for AF?
2–3.
Maximum daily dose of paracetamol in adults?
4 g (1 g every 4–6 hrs).
First-line antibiotic for CAP (non-severe)?
Amoxicillin
Allergy? –>
doxycycline/clarithromycin
First-line antibiotic for HAP?
Co-amoxiclav or piperacillin-tazobactam.
First-line antibiotic for UTI in non-pregnant women?
Nitrofurantoin.
First-line antibiotic for cellulitis?
Flucloxacillin
Allergy? –> clarithromycin/doxycycline
First-line antibiotic for bacterial meningitis in adults?
IV ceftriaxone ± dexamethasone.
Which antibiotics are high risk for C. diff? (4)
Macrolides (clarithromycin/erythromycin) + statins?
↑ risk of rhabdomyolysis.
ACEi/ARB + spironolactone + NSAID?
“Triple whammy” → hyperkalaemia/renal failure.
Why caution in Lithium + thiazide/ACEi/NSAID?
↑ lithium toxicity.
Warfarin + antibiotics (e.g. macrolides, metronidazole)?
↑ INR → bleeding risk.
What must you monitor for lithium therapy?
Lithium levels
Renal function
Thyroid function.
What must you monitor for digoxin?
Digoxin levels
renal function/electrolytes (esp. K⁺).
What must you monitor for gentamicin/vancomycin?
Trough/peak drug levels + renal function.
What must you monitor for ACE inhibitors?
U&Es (K⁺, creatinine) - kidney function
What must you monitor for methotrexate?