Type 2 Diabetes Medication: Metformin, Other Diabetes Medicines, and When Telehealth Is Enough

Last updated: August 17, 2026

Type 2 diabetes medication usually starts with metformin. People search “diabetes medications” and “metformin” for the same decision: an A1C came back high, or a clinician mentioned Glucophage, and they want to know what the pill actually does. Medicine lowers blood glucose. It does not replace food, movement, or follow-up labs.

This guide covers how clinicians pick diabetes medications, how metformin works, when a second class is added, and when a video visit is enough versus when you need labs or the ER. It is educational. It is not a diagnosis or a promise that any specific drug will be prescribed.

Want a licensed clinician to review an A1C or type 2 diabetes medication questions? Klarity Health has 2,000+ licensed providers. Many visits happen online. See online prescription options or browse conditions.

TLDR

• Most people with type 2 diabetes start with metformin pills (or liquid). Metformin helps the liver make less glucose and helps the body use insulin better. It may help a small amount of weight come off (NIDDK insulin and medicines).
• Metformin is a biguanide used alone or with other medicines, including insulin. It is not used for type 1 diabetes. Rare lactic acidosis is a boxed risk, especially with kidney disease, heavy alcohol use, or certain contrast procedures (MedlinePlus metformin).
• If lifestyle plus metformin does not bring glucose into range in about 3 months, clinicians often add a second oral class. A three-medicine combination can come next (MedlinePlus oral medicines).
• ADA/EASD guidance treats GLP-1 receptor agonists and SGLT-2 inhibitors as first-line options for many adults who also have atherosclerotic heart disease, heart failure, kidney disease, or high ASCVD risk. CDC researchers estimated about 82% of U.S. adults with type 2 diabetes may meet those criteria (CDC on newer diabetes medicines).
• Medicare covers many telehealth visits from home anywhere in the U.S. through December 31, 2027 (Medicare.gov telehealth). Confusion, vomiting you cannot keep down, chest pain, or blood sugar that will not come up is 911, not a video visit.

What type 2 diabetes medication is trying to fix

Type 2 diabetes means the body resists insulin and often does not make enough of it. Glucose stays in the blood. Over years that raises the chance of heart disease, stroke, kidney disease, nerve damage, and eye disease. NIDDK notes some people can control glucose with food, activity, sleep, and weight change. Many still need pills or injections. Over time you may need more than one medicine.

Typical home targets the CDC lists for many adults:

• Before a meal: 80 to 130 mg/dL
• Two hours after the start of a meal: under 180 mg/dL

Blood sugar under 70 mg/dL is low. If you are sick and a reading is 240 mg/dL or higher, check ketones. High ketones can signal diabetic ketoacidosis, which is an emergency.

Sources: NIDDK treatments; CDC manage blood sugar.

Metformin: the usual first diabetes medication

MedlinePlus classifies metformin as a biguanide. It lowers how much glucose you absorb from food, how much the liver makes, and it improves insulin response. It does not treat type 1 diabetes. Brands have included Fortamet, Glucophage, Glumetza, and Riomet. Many people take a generic.

How it is usually taken:

• Immediate-release tablet: with meals, two or three times a day
• Extended-release tablet: once daily with the evening meal; swallow whole
• Liquid: with meals, one or two times a day

Clinicians often start low and raise the dose no more often than every 1 to 2 weeks. Metformin controls diabetes. It does not cure it. Keep taking it even if you feel well unless the prescriber says to stop. An empty shell from some extended-release tablets can show up in stool. That does not mean you missed the dose.

Common side effects: diarrhea, nausea, gas, stomach discomfort, a metallic taste, headache. Some people develop low vitamin B12. Serious but rare: lactic acidosis. Stop the drug and get urgent care for extreme tiredness, vomiting, deep rapid breathing, feeling cold, or a very fast or slow heartbeat. Kidney disease, age over 65, heart failure, liver disease, heavy drinking, severe dehydration, and iodinated contrast studies change the risk. You may need to hold metformin around surgery or dye studies and restart only after the clinician says so, often at least 48 hours later.

Source: MedlinePlus metformin.

Other diabetes medications by class

MedlinePlus lists eight major oral classes. They can be used alone or together. NIDDK notes combining two or three kinds can lower glucose better than one drug.

SGLT2 inhibitors

These raise how much glucose leaves in urine. They may also lower weight and blood pressure a bit. Examples: canagliflozin (Invokana), dapagliflozin (Farxiga), empagliflozin (Jardiance). Urinary tract and yeast infections are common side effects. Tell the clinician about kidney disease first.

Sulfonylureas

These help the pancreas release insulin. Examples: glipizide (Glucotrol), glyburide, glimepiride (Amaryl). Low blood sugar is the main risk. Do not skip meals. Carry fast carbs. Weight gain can happen.

DPP-4 inhibitors

These help the body release more insulin and make less glucose, usually without causing hypoglycemia on their own. Examples: sitagliptin (Januvia), linagliptin (Tradjenta), saxagliptin, alogliptin. Side effects can include headache, stuffy nose, and, less often, severe joint pain.

Thiazolidinediones

Pioglitazone and rosiglitazone lower insulin resistance. Fluid retention, weight gain, lower bone density, and heart-failure risk matter. Ask before using them if you have heart or liver disease.

Meglitinides, alpha-glucosidase inhibitors, bile acid sequestrants

Meglitinides (repaglinide, nateglinide) raise mealtime insulin and can cause lows. Alpha-glucosidase inhibitors (acarbose, miglitol) slow starch absorption and often cause gas. Bile acid sequestrants such as colesevelam can lower both LDL and glucose.

GLP-1 receptor agonists and insulin

GLP-1 medicines are usually injections. NIDDK notes they can blunt the post-meal glucose rise, reduce hunger, and support some weight loss. They are not a substitute for insulin when insulin is required. Insulin itself comes in rapid, short, intermediate, long, and ultra-long forms. Type 1 diabetes always needs insulin. Type 2 may need it later, in the hospital, or in pregnancy.

If weight is part of the plan, a clinician may also discuss medical weight loss care. Those drugs are not a type 2 diabetes cure on their own. Coverage and prior authorization vary by plan.

Sources: MedlinePlus oral medicines; NIDDK treatments.

Who needs more than metformin

Lifestyle still comes first. NIDDK is clear that food, activity, sleep, and stress management sit under every prescription. If glucose is still high after about 3 months on metformin, a second class is typical. After another 3 months, a third medicine may be added. The choice depends on hypoglycemia risk, heart and kidney history, weight, cost, and other conditions such as high cholesterol.

In 2022, ADA and EASD recommended GLP-1s and SGLT-2s as first-line treatment for adults with type 2 diabetes who also have ASCVD, heart failure, kidney disease, or high ASCVD risk. CDC researchers later estimated 82% of U.S. adults with type 2 diabetes may meet those criteria, and almost all Medicare beneficiaries with type 2 diabetes may be eligible. During 2017-2020, only about 9% were already on one of those classes. Cost is still a barrier.

If you also have high blood pressure or high LDL, see our high blood pressure medication and cholesterol medication guides. Those pills often travel with diabetes medicines. They are not interchangeable.

Source: CDC newer diabetes medicines.

Prediabetes, metformin, and prevention

Prediabetes is glucose higher than normal but not yet diabetes. NIDDK lists A1C 5.7% to 6.4%, fasting plasma glucose 100 to 125 mg/dL, or an oral glucose tolerance test 140 to 199 mg/dL. About 97.6 million U.S. adults had prediabetes in 2021.

The Diabetes Prevention Program found that losing 5% to 7% of starting weight through diet and activity lowered the chance of type 2 diabetes. Metformin also delayed the disease, though less than the lifestyle program. It worked best for women with prior gestational diabetes, younger adults, and people with obesity. DPP follow-up has shown prevention or delay for at least 15 years with lifestyle change or metformin.

PCOS raises type 2 diabetes risk. Metformin used for PCOS metabolic risk is a different conversation than a type 2 diabetes start. See our PCOS treatment guide if cycles and androgens are the main problem.

Source: NIDDK insulin resistance and prediabetes.

When telehealth is enough

A video visit can often handle:

• Review of a recent A1C, fasting glucose, or home log
• Questions about metformin dose, diarrhea, or whether to switch to extended-release
• Refill of a stable, non-controlled diabetes medicine when labs are current
• Counseling on sick-day rules, hypoglycemia treatment, and when to add a second class

An online doctor visit still needs a licensed clinician in your state. Medicare covers many telehealth visits from home anywhere in the U.S. through December 31, 2027. Commercial coverage varies by plan. Verify benefits before you book. Klarity does not promise that any plan will pay for a specific visit or medicine.

Go in person or to the ER for:

• Confusion, seizure, or blood sugar that will not rise after fast carbs
• Persistent vomiting, inability to keep fluids down, or suspected DKA
• Chest pain, sudden weakness, or trouble speaking
• New insulin starts that need teaching you cannot complete on video
• Kidney function too low to continue metformin safely until labs are drawn

Sources: Medicare.gov telehealth; HHS telehealth policy updates.

Cost, insurance, and refills

Generic metformin is usually inexpensive. Newer GLP-1 and SGLT-2 drugs often need prior authorization. Formulary tier, deductible, and pharmacy network all change what you pay. A clinician can write a medically appropriate prescription. They cannot force a plan to cover it.

If you already have a current script and need a refill conversation, start with our online prescription refill guide. Metformin is not a controlled substance. Insulin and some other diabetes drugs still require a live clinical review when the dose changes.

Ready to talk through diabetes medications with a licensed clinician? See online prescription options.

FAQ

Is metformin the only type 2 diabetes medication?

No. It is the usual first oral medicine. Many people later add an SGLT-2 inhibitor, a GLP-1, a sulfonylurea, a DPP-4 inhibitor, or insulin. The mix depends on heart and kidney history, weight, cost, and how low your glucose goes.

Does metformin cause low blood sugar?

Used alone, metformin has a low risk of hypoglycemia. Risk rises if you also take insulin or a sulfonylurea, skip meals, drink heavily, or exercise much more than usual.

Can I get type 2 diabetes medication through telehealth?

Often yes for metformin and other non-controlled diabetes medicines when recent labs support the plan. A clinician still has to decide it is appropriate. Coverage varies. Emergency symptoms belong in an ER.

What A1C means I have diabetes versus prediabetes?

NIDDK uses A1C 5.7% to 6.4% for prediabetes. Diabetes diagnosis uses higher cutoffs that your clinician will confirm with the right test. Do not start or stop medicine from a home reading alone.

Disclaimer

This article is for education. It is not medical advice, a diagnosis, or a guarantee of insurance coverage. Coverage and prior authorization vary by plan. Confirm benefits before you book. Prescriptions are issued only when a licensed clinician determines they are appropriate. If you have chest pain, severe confusion, or suspected ketoacidosis, call 911.

Klarity Health connects patients with 2,000+ licensed providers. Many visits happen online. See online prescription options or browse conditions.