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Field METFORMIN
Endocrine · Endocrine · Level 3
SGLT2 Inhibitors
Endocrine · Endocrine · Level 3
Mechanism of action

- Enhance peripheral action of insulin
- ↑ rate of anaerobic glycolysis and ↓ rate of gluconeogenesis
- Inhibit intestinal absorption and ↓ peripheral utilization of glucose

Binding and blocking SGLT2 (Sodium-Glucose Co-Transporter 2) protein in proximal tubule of kidney. Results in:
- Reduced Renal glucose reabsorption
- Increased glucose excretion in urine

Physiological effects

CVS:
- ↓ intestinal absorption of glucose, folate, vit B12
- no effect on gastric motility
- ↑ utilization of glucose and cause weight loss
Metabolic/Other:
- ↑ sensitivity to peripheral actions of insulin by ↑ no of low affinity binding sites (RBC, Adipocytes, hepatocytes, sk. Muscle)
- inhibits metabolism of lactate and ↓ plasma TG, cholesterol, pre-beta lipoprotein

Metabolic:
- Reduced glucose levels and may improve insulin sensitivity in peripheral tissues
- Weight loss, lower TG, inc HDLc

CVS:
- Lower blood pressure due to fluid loss and potential improvements in vascular function
- Cardio protective (mainly Dapa and Empa): reduction in heart failure, major CV events, arrhythmia

Renal:
- mild diuresis (osmotic)
- renoprotective (red albuminuria and progression of diabetic kidney disease

Absorption

Slowly absorbed from small intestine
PO BA: 50-60%

Rapid
PO BA: 60-60%

Protein binding

Not protein bound

90-99% PB

Volume of distribution —

50-100L
Dapa: 118L Empa: 74L

Metabolism

No metabolites

Liver (phase 1 and 2 enzymes)
Dapa, Empa (CYP3A4)
Active and inactive metabolites

Excretion

Unchanged in urine

mostly urine
small fraction feces

Clearance

> GFR (Active tubular secretion)

6-12 L/hr

Half-life

Elimination half life 1.7-4.5 hrs

13-16hrs

Adverse Effects Toxicity

- Does not cause hypoglycaemia when used on its own
- GI disturbances
- Lactic acidosis (rare)

- Polyuria, UTIs, Dehydration
- Potential risk of AKI
- Ketoacidosis
- Toxicity (rare): excessive fluid loss and electrolyte imbalances

Chemical Pharmaceutics —

synthetic glycoside analogs that are chemically designed to resemble the naturally occurring glucose molecules but with modifications to inhibit glucose reabsorption

Class Group

Biguanides

SGLT2 Inhibitors

Indications Uses

treatment of non-insulin-dependent
(type II) diabetes mellitus

1. treatment of non-insulin-dependent
(type II) diabetes mellitus
2. risk reduction in cardiovascular events, heart failure and kidney disease progression, even without diabetes

Introduction —

Dapagliflozin
Empagliflozin
Ertugliflozin

Legacy Cicm Level

Level 3

Level 3

Main Action

Hypoglycaemia

reduction of blood glucose levels

Onset Peak Duration —

Onset variable
Peak 1-2hrs
Duration 24 hrs

Presentation

As 500/850 mg tablets of metformin hydrochloride
MR also available.

single medications or in combination with metformin or with gliptins

Route And Dose

PO
1-3gm daily in divided doses

PO

Special Points

Not recommended in renal impairment

- Renal dose adjustment in eGFR<30
- Risk of dehydeation and electrolyte imbalances