Escalating Diabetes with New Renal Impairment and Cost Worries
Madam Lim, 66, has been with your practice for four years. She has had type 2 diabetes for 12 years, hypertension and dyslipidaemia. Today's results: HbA1c 9.2% (7.8% six months ago), eGFR 38 mL/min/1.73 m² (55 a year ago), urine albumin-creatinine ratio 68 mg/mmol, BP 152/84, weight 78 kg, BMI 29. Current medicines: metformin 1 g twice daily, gliclazide MR 60 mg daily, perindopril 8 mg daily, atorvastatin 40 mg daily, plus ibuprofen she buys herself for knee pain. She has not had retinal photography or a foot examination for two years, has never had her statin dose reviewed, and is not enrolled in Healthier SG. She holds a Merdeka Generation card and CHAS Blue. She tells you she has been skipping metformin "because it is expensive and I feel fine", and asks whether she can stop the gliclazide instead, and whether "the new kidney injection" is available and affordable.
1. Set out your medication changes for today, with the reasoning and the safety monitoring that must accompany each change.
Read the worked answer
Stop the ibuprofen. This is the single highest-yield intervention. NSAIDs cause afferent arteriolar vasoconstriction, blunt the antihypertensive effect of perindopril and are a classic cause of an acute-on-chronic eGFR fall. Ask about frequency and duration and record it.
Metformin. At an eGFR of 38 the dose must be capped (commonly 1 g daily) and the patient counselled to hold it during acute illness, dehydration or before contrast. Below 30 it should be stopped. Check that the eGFR fall is not simply NSAID-related before making permanent changes - repeat renal function after stopping ibuprofen and any intercurrent illness.
Gliclazide. She is already on a modest dose; hypoglycaemia risk rises as eGFR falls, so this is not the drug to escalate. If she stops it on her own, glycaemic control will worsen.
Add an SGLT2 inhibitor. With albuminuria and eGFR in the high 30s, this is the evidence-based next step for renal and cardiovascular protection, and it is not dependent on glycaemic efficacy. Counsel on genital mycotic infection, sick-day rules, and the small risk of euglycaemic ketoacidosis; check volume status since she is on a loop-diuretic-free regimen.
Consider a GLP-1 receptor agonist for weight and glycaemia if affordability allows, rather than adding a sulfonylurea or insulin prematurely.
Statin. Atorvastatin 40 mg is reasonable; confirm adherence rather than reflexively escalating to 80 mg, since her LDL is unknown today.
Monitoring. Repeat eGFR and potassium 1–2 weeks after changes; home BP diary; review in 4 weeks with a repeat HbA1c at 3 months.
2. How would you structure this consultation to address her cost concerns and close the preventive care gaps within one or two visits?
Read the worked answer
Acknowledge the cost directly. "I hear that the tablets are a real strain, and I don't want you choosing between medicine and food." Naming the constraint makes the plan negotiable instead of imposed.
Fix the financing before the pharmacology.
- CDMP: diabetes, hypertension and dyslipidaemia are all on the Chronic Disease Management Programme, so Medisave can offset outpatient chronic care (currently around $400 per condition per year, subject to an annual per-patient cap and a co-payment). Confirm the prevailing figures on the CHAS/Medisave portal rather than quoting from memory.
- Healthier SG enrolment: as a Merdeka Generation cardholder with chronic conditions she is eligible. Enrolment brings a named family doctor, a written health plan, subsidised nationally recommended screenings and subsidised chronic care at the enrolled clinic. Dispensing at the clinic under the scheme is generally cheaper for her than pharmacy retail.
- Merdeka Generation and CHAS Blue outpatient subsidies stack with the above for subsidised attendees.
- Screen for Life covers diabetic eye screening and other recommended tests at subsidised rates for her age band and card tier.
Then make the regimen affordable. Prefer once-daily generic combinations, and give a written itemised cost comparison so she can see the change.
Preventive gaps. Book retinal photography and a foot examination with monofilament and pulses today if time allows, otherwise book before she leaves - a verbal "come back for eye screening" rarely converts. Add urine ACR monitoring, and record a repeat BP and weight at each visit.
Safety-netting. Explain sick-day rules for metformin and perindopril in one sentence and on a card: stop both if vomiting or unable to drink, and call the clinic.