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🩺 Practical OPD Guide: Starting Anti-Diabetic Drugs

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First: Understand the Pattern Before Starting a Drug

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DRUG-BY-DRUG BREAKDOWN

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1. 🟢 METFORMIN — Your First Drug, Almost Always

• Virtually every newly diagnosed T2DM patient as first-line (Goodman & Gilman's, p.1054)
• Overweight/obese patients especially
• Young patients
• IGT (pre-diabetes) — delays progression to diabetes

• 500 mg with dinner, then after 1–2 weeks add 500 mg with breakfast
• Titrate up to 1000 mg BD (max 2000–2550 mg/day)
• Take with food — reduces GI side effects

Patient: 45M, FBG 160, PP 240, BMI 28, no other disease Start: Metformin 500 mg BD with meals, increase to 1000 mg BD in 4 weeks. Review HbA1c at 3 months.

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2. 🟡 SULFONYLUREAS — Cheap, Effective, but Caution

• When metformin alone is not enough
• Lean/thin diabetic patients (not overweight — weight gain is an issue)
• High fasting glucose mainly (they work on basal insulin release)
• Gliclazide / Glimepiride preferred (safer, less hypoglycemia than glibenclamide)

• Glimepiride: 1–2 mg once daily with breakfast
• Gliclazide MR: 30–60 mg once daily with breakfast
• Glibenclamide: 2.5 mg OD with breakfast (old drug, avoid in elderly)

Case 1: 55M, FBG 200, PP 290, not obese, metformin not sufficient Add: Glimepiride 1 mg OD with breakfast. Counsel about hypoglycemia.

Case 2: 70F, HbA1c 9.5%, on metformin Prefer Gliclazide MR 30 mg OD — safer in elderly, less hypoglycemia than glibenclamide

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3. 🔴 GLITAZONES (Pioglitazone) — Insulin Sensitizers

• Insulin resistant patients (metabolic syndrome, PCOS, NAFLD)
• Patients where metformin is not tolerated
• High PP glucose pattern (good sensitizer)
• Type 2 DM with NASH/fatty liver (pioglitazone actually helps NAFLD)

• Pioglitazone 15 mg OD → increase to 30 mg OD after 4 weeks
• Onset is SLOW — full effect in 1–3 months

Patient: 48F, T2DM with NAFLD on ultrasound, BMI 31, FBG 175 Add: Pioglitazone 15 mg OD — benefits both diabetes and fatty liver

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4. 🔵 DPP-4 INHIBITORS (Gliptins) — Safe but Expensive

• Elderly patients (very safe, no hypoglycemia)
• CKD patients (most can be used with dose adjustment)
• When weight neutrality is important
• When patient can afford it
• High PP glucose mainly (works on mealtime glucose)

• Sitagliptin 100 mg OD (50 mg if eGFR 30–50; 25 mg if <30)
• Teneligliptin 20 mg OD — cheapest gliptin, ₹15–20/day
• Vildagliptin 50 mg BD

Patient: 68M, T2DM, CKD stage 3 (eGFR 42), FBG 140, PP 230 Use: Sitagliptin 50 mg OD (dose-adjusted) + Metformin is borderline — use cautiously or replace with Teneligliptin

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5. 💧 SGLT2 INHIBITORS — Modern, Expensive but Cardio-Protective

• T2DM + Heart failure → Empagliflozin or Dapagliflozin are life-saving (EMPA-REG, DAPA-HF trials)
• T2DM + CKD (Dapagliflozin reduces CKD progression — DAPA-CKD trial)
• T2DM + Obesity (causes 2–3 kg weight loss)
• Hypertension with T2DM (also lowers BP)

• Empagliflozin 10 mg OD (morning, before food)
• Dapagliflozin 10 mg OD
• Canagliflozin 100 mg OD before first meal

Case 1: 52M, T2DM + HbA1c 8.5%, recent heart failure with reduced EF Must use: Empagliflozin 10 mg OD — reduces hospitalization and death in HF

Case 2: 58F, T2DM + CKD (eGFR 55, proteinuria), HbA1c 8% Use: Dapagliflozin 10 mg OD — slows CKD progression

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6. 💉 GLP-1 RECEPTOR AGONISTS — Newest, Most Expensive

• T2DM + Obesity (most powerful weight loss — 5–15 kg)
• T2DM + Cardiovascular disease (Liraglutide/Semaglutide reduce MACE)
• When patient can afford and tolerates injections
• HbA1c very high (>10%) with need for big glucose drop

• Liraglutide 0.6 mg SC OD × 1 week → 1.2 mg → 1.8 mg
• Semaglutide weekly injection 0.25 mg × 4 weeks → 0.5 mg → 1 mg

Patient: 44F, BMI 38, T2DM + NAFLD + cardiovascular risk, HbA1c 9.5%, can afford Start: Semaglutide 0.25 mg/week + Metformin. Will lose significant weight, improve liver, reduce CV risk.

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7. 🌾 ALPHA-GLUCOSIDASE INHIBITORS (Acarbose) — Postprandial Specialist

• Postprandial glucose mainly high, FBG near normal
• Indian diet (rice/roti heavy — lots of carbs)
• Elderly (very safe)
• Mild diabetes or pre-diabetes

• Acarbose 25 mg OD with first bite of meal → increase to 25 mg TDS → max 100 mg TDS

Patient: 62F, FBG 115 (near normal), PP 220, BMI 24, no other drugs Start: Acarbose 25 mg with each meal — perfectly targeted for her postprandial problem

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8. ⚡ MEGLITINIDES (Repaglinide) — Mealtime Sugar

• Isolated postprandial hyperglycemia
• Irregular meal schedule (taken only when eating — flexible)
• CKD (repaglinide safe in CKD)
• When sulfonylurea causes too much hypoglycemia

Patient: 50M, FBG 125, PP 240, irregular eating schedule (skips meals sometimes) Use: Repaglinide 0.5 mg before each meal he eats — no meal, no tablet

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SIDE EFFECT SUMMARY TABLE

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AFFORDABLE COMBINATIONS (Budget Patients)

Combination 1 — Cheapest effective combo

• Cost: ₹3–8/day
• Good for: Most newly diagnosed T2DM with FBG + PP both elevated
• Watch: Counsel about hypoglycemia with glimepiride

Combination 2 — Fasting high, no weight issues

• Cost: ₹5–10/day
• Good for: Elderly, better than glibenclamide

Combination 3 — PP high, affordable

• Cost: ₹5–12/day
• Good for: Postprandial high, Indian high-carb diet, obese

Combination 4 — Both FBG + PP high, affordable

• Cost: ₹10–20/day
• Good for: HbA1c >9%, obese insulin-resistant patients

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EXPENSIVE COMBINATIONS (Patients Who Can Afford)

Combo A — Diabetic + Obese

• Best for weight loss + glucose control + CV protection

Combo B — Diabetic + Heart Failure

• Reduces HF hospitalization and mortality

Combo C — Diabetic + CKD

• Slows CKD progression, safe in mild-moderate CKD

Combo D — Elderly T2DM, avoid hypoglycemia

• Very safe, no hypoglycemia, well tolerated

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QUICK OPD DECISION FLOWCHART

NEW T2DM PATIENT
        │
        ▼
Start METFORMIN 500 mg BD (always, unless contraindicated)
        │
  3 months → Review HbA1c / FBG / PP
        │
   ┌────┴────┐
FBG high    PP high   Both high
   │           │          │
Add         Add        Add SU or
Glimepiride  Acarbose   Pioglitazone
or SU        or DPP4   or DPP4
        │
  If still uncontrolled (HbA1c >8.5%)
        │
 Add 3rd agent OR consider Insulin
        │
  If HbA1c >10% at diagnosis → Start insulin + OHA together

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IMPORTANT CLINICAL PEARLS FOR OPD

1. Never start glibenclamide in elderly — too long-acting, deadly hypoglycemia. Use gliclazide MR or glimepiride.
2. Metformin + fasting glucose: Metformin mainly reduces fasting glucose (reduces hepatic glucose production overnight). It's particularly good for elevated FBG.
3. Acarbose / Repaglinide for PP glucose: These specifically target postprandial spikes. Great for patients with near-normal FBG but elevated PP.
4. Pioglitazone + edema: Always ask about heart failure before prescribing. Don't use if NYHA Class 3–4 HF.
5. If patient can't afford anything: Metformin + Glimepiride combo tablet (cheap, widely available) is your workhorse. Add Acarbose for PP if needed.
6. Always counsel on hypoglycemia: Any patient on sulfonylurea or insulin must know to eat regularly and carry sugar. Hypoglycemia is more dangerous than mild hyperglycemia.
7. SGLT2 inhibitors before surgery: STOP 3–4 days before any procedure — risk of euglycemic DKA.
8. Renal dose adjustments:

• Metformin: Stop if eGFR <30; reduce if eGFR 30–45
• Glipizide/Gliclazide: Relatively safe in CKD
• Sitagliptin: Dose reduce in CKD
• Repaglinide: Safe in CKD
• SGLT2i: Avoid if eGFR <45

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SUMMARY: WHICH PATIENT GETS WHAT

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📋 ANTI-DIABETIC PRESCRIPTION FORMATS

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🟢 MONOTHERAPY PRESCRIPTIONS

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Rx 1 — New T2DM, Any Patient (First Line)

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals × 4 weeks
   Then increase to
   Tab. Metformin 1000 mg        1-0-1 with meals (maintenance)

Advice: Take with food. Drink plenty of water.
Watch for: Nausea, loose stools (usually settles in 2 weeks)
Review: After 3 months with FBG, PP, HbA1c

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Rx 2 — Postprandial High, FBG Near Normal

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals
2. Tab. Acarbose 25 mg           1-1-1 with first bite of each meal
   (After 4 weeks, increase to Acarbose 50 mg TDS if tolerated)

Advice: Chew Acarbose with first bite — do NOT take after meals
Watch for: Gas, bloating (very common initially)

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Rx 3 — Elderly, Mild T2DM (Safe, No Hypo)

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals
2. Tab. Teneligliptin 20 mg      1-0-0 (morning, any time)
   OR
   Tab. Vildagliptin 50 mg       1-0-1

Advice: No risk of hypoglycemia. Check renal function every 6 months.

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🔵 DUAL COMBINATION PRESCRIPTIONS

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Rx 4 — High FBG + High PP, Normal Weight (Affordable)

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals
2. Tab. Glimepiride 1 mg         1-0-0 (before breakfast)

Advice: Do NOT skip meals after taking Glimepiride.
        Keep 2 glucose tablets or sugar in pocket at all times.
Watch for: Hypoglycemia (sweating, trembling, dizziness)
If hypoglycemia occurs: Take 2 tsp sugar in water immediately.

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Rx 5 — High FBG + PP, Elderly (Safer Sulfonylurea)

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals
2. Tab. Gliclazide MR 30 mg      1-0-0 (with breakfast)
   (Can increase to 60 mg OD after 4 weeks if needed)

Note: Gliclazide MR preferred over Glibenclamide in elderly —
      less risk of prolonged hypoglycemia.

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Rx 6 — High PP, Insulin Resistant, Obese

Rx
1. Tab. Metformin 1000 mg        1-0-1 with meals
2. Tab. Pioglitazone 15 mg       0-0-1 (with dinner)
   (Increase to 30 mg OD after 4–6 weeks)

Advice: Monitor weight and check for leg swelling monthly.
Watch for: Edema, weight gain (fluid retention)
Avoid if: Any heart failure, osteoporosis

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Rx 7 — T2DM + Obesity (Modern, Affordable Option)

Rx
1. Tab. Metformin 1000 mg        1-0-1 with meals
2. Tab. Empagliflozin 10 mg      1-0-0 (morning, before food)
   OR Tab. Dapagliflozin 10 mg   1-0-0

Advice: Drink plenty of water (2.5–3 L/day).
        Wash genital area daily — prevent fungal infection.
Watch for: Increased urination (expected), genital itching

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Rx 8 — T2DM + CKD Stage 3 (eGFR 30–60)

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals
   (Use cautiously — reduce dose if eGFR 30–45; stop if <30)
2. Tab. Sitagliptin 50 mg        1-0-0
   OR Tab. Teneligliptin 20 mg   1-0-0

Note: Dose-adjust Sitagliptin based on eGFR:
      eGFR >50 → 100 mg OD
      eGFR 30–50 → 50 mg OD
      eGFR <30 → 25 mg OD

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Rx 9 — T2DM + Heart Failure (Life-Saving Combo)

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals
2. Tab. Empagliflozin 10 mg      1-0-0 (morning)
   OR Tab. Dapagliflozin 10 mg   1-0-0

IMPORTANT: Empagliflozin/Dapagliflozin REDUCE heart failure
           hospitalization and mortality (EMPA-REG / DAPA-HF trials).
           This combination is strongly recommended in T2DM + HFrEF.
Avoid: Sulfonylurea, Pioglitazone (worsens fluid retention in HF)

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Rx 10 — T2DM + NAFLD / Fatty Liver

Rx
1. Tab. Metformin 1000 mg        1-0-1 with meals
2. Tab. Pioglitazone 15–30 mg    0-0-1 with dinner

Note: Pioglitazone improves NASH histology — approved use.
      Monitor LFTs at baseline and every 3 months.
Avoid if: Bladder cancer history, active liver disease, osteoporosis

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Rx 11 — Irregular Meals / Shift Worker (Flexible Dosing)

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals
2. Tab. Repaglinide 0.5 mg       Before each main meal only
   (Take ONLY when eating a meal — skip if skipping meal)
   (Can increase to 1 mg before each meal if needed)

Advice: This drug is flexible — if you skip a meal, skip the tablet.
        Best for patients with irregular eating schedule.

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🔴 TRIPLE COMBINATION PRESCRIPTIONS

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Rx 12 — HbA1c 8.5–10%, Affordable Triple Combo

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals
2. Tab. Glimepiride 2 mg         1-0-0 (before breakfast)
3. Tab. Pioglitazone 15 mg       0-0-1 (with dinner)

OR use Fixed-Dose Combination:
   Tab. Metformin 500 mg +
   Glimepiride 2 mg +
   Pioglitazone 15 mg            1-0-1

[Available as: Tribet / Glimin-P / Glypizide-MG — ₹15–25/day]
Counsel: Hypoglycemia risk (SU present), weight gain likely

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Rx 13 — HbA1c 8.5–10%, Budget-Moderate Triple

Rx
1. Tab. Metformin 1000 mg        1-0-1 with meals
2. Tab. Glimepiride 1 mg         1-0-0 (before breakfast)
3. Tab. Teneligliptin 20 mg      1-0-0 (any time)

Advantage: DPP4 adds PP control without additional hypoglycemia risk
Note: Teneligliptin is cheapest gliptin — ₹15–20/day

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Rx 14 — T2DM + Obesity + CV Risk (Premium Triple)

Rx
1. Tab. Metformin 1000 mg        1-0-1 with meals
2. Tab. Empagliflozin 10 mg      1-0-0 (morning)
3. Tab. Sitagliptin 100 mg       1-0-0

Benefits: Weight loss (SGLT2i), PP control (DPP4i),
          CV protection (Empa), no hypoglycemia
Cost: ₹80–120/day

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Rx 15 — HbA1c >10%, Both High, Needs Fast Control

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals
2. Tab. Glimepiride 2 mg         1-0-0 (before breakfast)
3. Tab. Acarbose 50 mg           1-1-1 (with first bite of meals)

Logic: Metformin → FBG ↓ | Glimepiride → FBG + PP ↓ |
       Acarbose → PP spike ↓
Cost: ₹10–15/day — very affordable

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Rx 16 — T2DM + CKD + CV Risk (Kidney-Safe Triple)

Rx
1. Tab. Metformin 500 mg         1-0-0 (if eGFR >45 only)
2. Tab. Dapagliflozin 10 mg      1-0-0 (morning)
3. Tab. Sitagliptin 50 mg        1-0-0 (dose-adjusted for CKD)

Note: Dapagliflozin slows CKD progression independently of glucose.
      Stop Metformin if eGFR drops <45.

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💉 INSULIN-BASED COMBINATION PRESCRIPTIONS

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Rx 17 — Add Basal Insulin to OHA (FBG Still High)

Rx
1. Tab. Metformin 1000 mg        1-0-1 with meals
2. Tab. Glimepiride 2 mg         1-0-0 (before breakfast)
3. Inj. Glargine (Lantus/Basalog) SC at bedtime
   Starting dose: 0.1–0.2 units/kg/day
   (e.g., 70 kg patient → start 10 units at 10 PM)
   Titrate: Increase by 2 units every 3 days until
            FBG reaches 80–110 mg/dL

Advice: Inject in abdomen or thigh. Rotate sites.
        Check FBG daily and maintain log.
Emergency: Keep glucagon kit or sugar sachets at home.

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Rx 18 — HbA1c >10% at First Visit (Symptomatic: Polyuria, Polydipsia, Weight Loss)

Rx
1. Inj. Human Mixtard 30/70 (or Novomix 30)
   — 8 units before breakfast SC
   — 6 units before dinner SC
   (Titrate by 2 units every 3 days based on readings)
2. Tab. Metformin 500 mg         1-0-1 with meals

Note: Start insulin early in very symptomatic patients.
      Once HbA1c controlled, can switch back to OHA + basal insulin.
Review: Every 2 weeks initially

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Rx 19 — T2DM on OHA + Basal Insulin, PP Still High (Basal-Bolus)

Rx
1. Tab. Metformin 1000 mg        1-0-1 with meals
2. Inj. Glargine 20 units        SC at bedtime (basal)
3. Inj. Aspart (Novorapid) OR
   Inj. Lispro (Humalog)         4 units SC before each main meal
   (Titrate prandial insulin: if PP >180, add 1 unit before that meal)

Note: This is full basal-bolus regimen — for well-motivated patients
      with glucose monitoring capability.

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🌿 SPECIAL SITUATION PRESCRIPTIONS

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Rx 20 — T2DM in PREGNANCY / Gestational Diabetes

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals
   (If not controlled by 2 weeks, add insulin)
2. Inj. Human Actrapid / Regular Insulin
   4 units before meals SC (if FBG >95 or PP >120 mg/dL)

AVOID: All OHAs except Metformin in pregnancy
       (Sulfonylureas, SGLT2i, GLP1, DPP4 — all contraindicated)
Target: FBG <95 mg/dL | 1-hr PP <140 | 2-hr PP <120 mg/dL

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Rx 21 — T2DM + PCOS

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals
   Increase to 1000 mg BD after 4 weeks
   (Improves ovulation, reduces androgens, helps weight)
2. Tab. Pioglitazone 15 mg       0-0-1 (if insulin resistant + no pregnancy wish)
   OR
   Tab. Sitagliptin 100 mg       1-0-0

If trying to conceive: Use Metformin only + add Clomiphene/Letrozole

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Rx 22 — T2DM + Steroid-Induced Hyperglycemia

Rx
1. Tab. Metformin 500 mg         1-0-1 with meals (if tolerated)
2. Tab. Repaglinide 1 mg         Before each meal
   OR
   Inj. Regular Insulin (sliding scale) if severe

Note: Steroids cause mainly PP hyperglycemia.
      Repaglinide/short-acting insulin targets mealtime spikes best.
      Monitor PP specifically. May need dose adjustments as steroid tapers.

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📊 COMPLETE DRUG REFERENCE CARD

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⚠️ NEVER FORGET TO WRITE THESE IN EVERY PRESCRIPTION

General Advice (print on all diabetes prescriptions):
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
• Take medicines regularly — do NOT stop without asking doctor
• Do NOT skip meals, especially if on Sulfonylurea or Insulin
• Walk 30–45 min daily
• Avoid rice/maida/sugar/fried food excess
• Check FBG and PP glucose every 2 weeks initially
• HbA1c every 3 months until controlled, then 6-monthly
• Check eyes, kidneys, feet yearly
• If sweating/shaking suddenly — eat 2 tsp sugar in water IMMEDIATELY
• Carry a diabetes ID card
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💡 QUICK RECALL MNEMONICS