Medications for Type 2 Diabetes
ICD-10: E11
Medically Reviewed by Dr. Sarah Chen, PharmD, BCPS
Clinical Pharmacist & Medical Reviewer
Last reviewed: March 19, 2026
Key Takeaways
- Metformin remains the preferred first-line pharmacologic agent for most patients with type 2 diabetes due to its efficacy, safety, and low cost.
- GLP-1 receptor agonists and SGLT-2 inhibitors have demonstrated cardiovascular and renal benefits beyond glucose lowering and are preferred add-on agents in high-risk patients.
- HbA1c goal for most adults is <7%, though individualized targets (6.5–8%) are appropriate based on age, comorbidities, and hypoglycemia risk.
- SGLT-2 inhibitors reduce hospitalizations for heart failure and slow CKD progression — benefits independent of glucose control.
- Generic metformin costs $4–$10/month; newer agents (GLP-1 agonists, SGLT-2 inhibitors) can cost $500–$900/month without insurance.
Overview
Type 2 diabetes is the most common form of diabetes, accounting for 90–95% of all diabetes cases. It develops when the body becomes resistant to insulin or doesn't produce enough insulin to maintain normal blood glucose levels.
Treatment Overview
Treatment includes lifestyle modifications (diet, exercise, weight loss) and medications. Metformin is the first-line drug therapy. Additional medications are added as needed to achieve blood sugar targets.
23
Total Medications
3
Drug Classes
5
Off-Label Uses
Drug Classes for Type 2 Diabetes
Pharmacist-reviewed overview of each medication class, how it works, and when it's used.
Biguanides
Metformin
Mechanism of Action
Primarily reduces hepatic glucose production (gluconeogenesis) by activating AMPK. Also improves peripheral insulin sensitivity. Does not stimulate insulin secretion and carries no hypoglycemia risk as monotherapy.
Common Examples
Clinical Notes
First-line for all patients without contraindications. Reduces HbA1c by 1–2%. Hold before contrast procedures and in acute illness. Extended-release formulation reduces GI side effects.
Common Side Effects
- GI upset (nausea, diarrhea) — usually transient
- Vitamin B12 deficiency with long-term use
- Lactic acidosis (rare, mainly in renal impairment)
GLP-1 Receptor Agonists
GLP-1 RAs
Mechanism of Action
Mimic glucagon-like peptide-1, stimulating glucose-dependent insulin secretion, suppressing glucagon, slowing gastric emptying, and reducing appetite. Cardiovascular and renal benefits are partly independent of glucose lowering.
Common Examples
Clinical Notes
Preferred add-on (or first-line in high-risk patients) when ASCVD, heart failure, or CKD is present. Semaglutide and liraglutide have the strongest cardiovascular outcomes data. Tirzepatide (dual GLP-1/GIP) achieves the greatest HbA1c and weight reductions.
Common Side Effects
- Nausea and vomiting (most common, usually transient)
- Diarrhea
- Injection site reactions
- Pancreatitis (rare)
- Thyroid C-cell tumors (rodent data; avoid in personal/family history of MTC)
SGLT-2 Inhibitors
SGLT-2i
Mechanism of Action
Block the sodium-glucose cotransporter 2 (SGLT-2) in the proximal renal tubule, causing urinary glucose excretion of 60–80 g/day. Also reduce renal sodium reabsorption, lowering blood pressure and reducing cardiac preload.
Common Examples
Clinical Notes
Preferred add-on when heart failure with reduced EF or CKD (eGFR ≥20) is present. Empagliflozin and dapagliflozin have FDA indications for heart failure regardless of diabetes status.
Common Side Effects
- Genital mycotic infections (common)
- UTIs
- Euglycemic DKA (rare but serious)
- Volume depletion
- Lower limb amputations (canagliflozin — monitor foot care)
DPP-4 Inhibitors
Gliptins
Mechanism of Action
Inhibit dipeptidyl peptidase-4 (DPP-4), which normally degrades GLP-1 and GIP. By preserving endogenous incretin levels, they enhance glucose-dependent insulin secretion and suppress glucagon.
Common Examples
Clinical Notes
Weight-neutral and well-tolerated. Modest HbA1c reduction (0.5–0.8%). No hypoglycemia risk as monotherapy. Preferred when GLP-1 RA or SGLT-2i are not tolerated or affordable.
Common Side Effects
- Nasopharyngitis
- Urinary tract infections
- Pancreatitis (rare)
- Joint pain (rare)
Sulfonylureas
SUs
Mechanism of Action
Stimulate insulin secretion by binding to ATP-sensitive potassium channels on pancreatic beta cells, causing depolarization and calcium-dependent insulin release. Effect is glucose-independent.
Common Examples
Clinical Notes
Inexpensive and effective (HbA1c reduction 1–2%), but carry risk of hypoglycemia and weight gain. Glipizide and glimepiride are preferred over glyburide (shorter half-life, lower hypoglycemia risk). Avoid glyburide in elderly patients.
Common Side Effects
- Hypoglycemia (most significant risk)
- Weight gain (2–4 kg)
- Photosensitivity
All Medications
FDA-approved and commonly used medications for Type 2 Diabetes in our database.
Off-Label Uses
Lovastatin
(Lovastatin)Off-LabelLOVASTATIN (brand name: Lovastatin) is a statin (HMG-CoA reductase inhibitor). Indications and Usage Therapy with lovastatin should be a component of multiple risk factor intervention in those individuals with dyslipidemia at risk for atherosclerotic vascular disease. Lovastatin should be used in addition to a diet restricted in saturated fat and cholesterol as part of a…
Atorvastatin
(Lipitor)Off-LabelAtorvastatin (Lipitor) is the world's best-selling prescription drug and the most widely prescribed statin for lowering LDL ('bad') cholesterol and reducing the risk of heart attack, stroke, and cardiovascular death. It is used for both primary prevention (in people without established heart disease but with risk factors) and secondary prevention (in people who have already had a heart attack or stroke). Generic atorvastatin is available for as little as $4–$25 per month.
Generic Available
Captopril
(Captopril)Off-LabelCaptopril is a medication belonging to a class of drugs called ACE inhibitors, primarily used to treat high blood pressure (hypertension). It works by helping to relax blood vessels, which allows blood to flow more easily and lowers blood pressure.
Losartan Potassium
(Cozaar)Off-LabelLosartan potassium (Cozaar) is an angiotensin II receptor blocker (ARB) used to treat high blood pressure, protect the kidneys in type 2 diabetes, and reduce the risk of stroke in patients with hypertension and left ventricular hypertrophy. Unlike ACE inhibitors, losartan does not cause a dry cough and carries a significantly lower risk of angioedema. It is also the only ARB with a clinically meaningful uricosuric (uric acid-lowering) effect, making it a preferred choice in patients with hypertension and gout.
Irbesartan
(Irbesartan)Off-LabelIRBESARTAN (brand name: Irbesartan) is a ARBs. 1 INDICATIONS & USAGE Irbesartan tablet is an angiotensin II receptor blocker (ARB) indicated for: • Treatment of hypertension, to lower blood pressure. Lowering blood pressure reduces the risk of fatal and nonfatal cardiovascular events, primarily strokes and myocardial infarctions. ( 1.1 ) •…
How to Choose the Right Medication
Clinical decision factors used by prescribers when selecting a treatment.
- 1Start metformin at diagnosis unless contraindicated (eGFR <30, contrast procedure, hospitalization).
- 2Add a GLP-1 RA or SGLT-2i as second agent if ASCVD, heart failure, or CKD is present — regardless of HbA1c.
- 3Add a DPP-4 inhibitor or sulfonylurea as second agent when cost is a primary concern and cardiovascular risk is low.
- 4For patients needing >1.5% HbA1c reduction, tirzepatide or high-dose semaglutide are the most potent options.
- 5Avoid sulfonylureas in elderly patients (hypoglycemia risk) and glyburide specifically in all patients with renal impairment.
- 6Consider insulin when HbA1c is very high (>10–11%) or when oral agents are insufficient.
Monitoring & Follow-Up
- Check HbA1c every 3 months until at goal, then every 6 months.
- Monitor eGFR and potassium annually (or more frequently) in patients on SGLT-2i or ACEi/ARB.
- Foot exams and dilated eye exams annually.
- Educate on hypoglycemia recognition and treatment (15 g fast-acting carbohydrates) for patients on sulfonylureas or insulin.
Find the lowest price for any medication
Real-time prices at 67,000+ pharmacies · Free · No sign-up
Frequently Asked Questions
What is the difference between type 1 and type 2 diabetes?
Type 1 diabetes is an autoimmune condition where the body destroys insulin-producing cells. Type 2 is characterized by insulin resistance and relative insulin deficiency, strongly associated with lifestyle factors and genetics.
What is the difference between Ozempic and Mounjaro?
Both are injectable medications used for type 2 diabetes, but they work differently. Ozempic (semaglutide) is a GLP-1 receptor agonist — it activates one hormone receptor. Mounjaro (tirzepatide) is a dual GIP/GLP-1 receptor agonist — it activates two hormone receptors simultaneously. Clinical trials show tirzepatide achieves greater HbA1c reduction and weight loss than semaglutide. Both have weekly dosing schedules. See our full comparison: Mounjaro vs. Ozempic.
Can type 2 diabetes be reversed with medication?
Type 2 diabetes can go into remission (HbA1c <6.5% without medication) through significant weight loss — typically 10–15% of body weight. Bariatric surgery achieves remission in 50–80% of patients. GLP-1 receptor agonists and tirzepatide, which cause substantial weight loss, have also been associated with remission in some patients. However, 'reversal' requires sustained lifestyle changes; the underlying metabolic predisposition remains.
References & Clinical Sources
Protect your muscle mass while taking semaglutide (Ozempic, Wegovy) or tirzepatide (Mounjaro)
GLP-1 medications can cause up to 39% muscle loss alongside fat. Zova's AI-powered protocol — backed by Lancet Diabetes & Endocrinology research — reduces that to just 8.7% through leucine tracking and injection-day adaptive nutrition.
No credit card. No commitment.
Get the RxGo app — free prescription discounts on the go
Works at 67,000+ pharmacies · No membership needed
Medical Disclaimer
The information on RxGuide is intended for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician, pharmacist, or other qualified health provider with any questions you may have regarding a medical condition or medication. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.