Ozempic® vs Metformin: What’s the Difference?

SUMMARY

Ozempic® and metformin are both prescription medications, but they are quite different.

They contain different active ingredients, belong to different medication classes and work through different biological pathways. 

So why are they compared?

Both medications can be part of a prescription treatment plan, and some people may encounter both when discussing their medication options with a practitioner. Understanding how they differ can help you ask better questions about your prescription and have a more informed conversation with your practitioner or pharmacist.

WHAT YOU'LL LEARN

• What Ozempic® is
• What metformin is
• How the two medications work differently
• The difference between a GLP-1 receptor agonist and a biguanide
• How Ozempic® and metformin are taken
• Whether they can be prescribed together
• How their costs and generic availability compare
• Why one medication isn't automatically a substitute for the other

If you've searched for Ozempic® vs metformin, you may be wondering why these two medications are being compared in the first place.

They aren't the same medication, and they don't belong to the same drug class. Their mechanisms of action are also different.

However, both are prescription medications that may be considered as part of an individual's treatment plan. Depending on a person's circumstances, a practitioner may prescribe one medication, another medication, or more than one medication.

Here's how they compare.

Ozempic® vs metformin at a glance

The important takeaway is that Ozempic® and metformin are different medications with different mechanisms of action. They should not be treated as interchangeable.

What is Ozempic®?

Ozempic® is a prescription medication containing semaglutide, which belongs to a class of medications called GLP-1 receptor agonists. GLP-1 is a naturally occurring hormone involved in processes such as insulin release, glucagon regulation and digestion.

In Canada, Ozempic® is supplied as a prefilled injection pen for subcutaneous administration. The specific product, strength and directions for use are determined by the prescribing practitioner.

What is metformin?

Metformin is a prescription medication that belongs to the biguanide class.

Unlike Ozempic®, metformin is taken orally.

It has been used in clinical practice for many years and is available in different formulations, including immediate-release and extended-release products. 

The different formulations can have different administration instructions, so the directions on an individual's prescription should always be followed.

How do Ozempic® and metformin work?

This is one of the biggest differences between the two medications.

How Ozempic® works

Semaglutide works in a similar way to a hormone called GLP-1, which your body naturally produces. It affects processes that help regulate blood sugar, insulin and digestion.

How metformin works

Metformin works differently from semaglutide. It affects how the body uses insulin and how much glucose the liver produces.

In simple terms, metformin changes the way the body handles glucose and responds to insulin.

Why does the difference matter?

It means that although both medications influence the body's handling of glucose, they do so in different ways.

This is one reason a practitioner doesn't simply treat Ozempic® and metformin as interchangeable medications.

How are Ozempic® and metformin taken?

Another major difference is how the medications are administered.

Ozempic®

Ozempic® is administered by subcutaneous injection.

The medication is supplied in a prefilled pen, and the specific administration schedule depends on the prescription.

Metformin

Metformin is taken by mouth.

Depending on the formulation, metformin may be available as an immediate-release or extended-release tablet. The frequency and directions depend on the specific prescription.

The important point is that the two medications have completely different administration requirements.

If you are prescribed either medication, follow the instructions provided by your practitioner and pharmacist.

Can Ozempic® and metformin be taken together?

They can sometimes be prescribed as part of the same treatment plan.

Because Ozempic® and metformin work through different mechanisms, a practitioner may prescribe more than one medication when clinically appropriate.

Diabetes Canada's clinical guidance recognizes that more than one medication may be required depending on an individual's treatment needs.

Whether using both medications is appropriate depends on the individual's prescription, other medications and relevant health considerations.

If you're taking more than one prescription medication, your pharmacist can review your medication regimen with you and answer questions about how the medications fit together.

Do not start, stop or combine prescription medications on your own.

Are Ozempic® and metformin interchangeable?

No.

Although both are prescription medications that can appear in similar treatment discussions, they contain different active ingredients and work differently.

Changing from one medication to another is not simply a matter of choosing a different brand or formulation.

A practitioner considers factors such as an individual's health history, current medications, kidney function, treatment goals and other relevant considerations when selecting an appropriate medication.

What about side effects?

Prescription medications can have risks and adverse reactions, and those risks aren't identical between Ozempic® and metformin.

The safety profile of a medication depends on the specific product and the individual taking it.

Rather than trying to determine from a general online article whether a particular medication is safe for you, the appropriate approach is to review the product information and discuss your individual circumstances with your practitioner or pharmacist.

Your pharmacist can also explain what to watch for and what to do if you have concerns about your prescription.

For a detailed review of risks and precautions, refer to the Canadian product monograph or speak with your healthcare team.

How does cost compare between Ozempic® and metformin?

The cost difference can be significant, but there isn't one universal price for either medication.

Your total prescription cost can depend on:

• The specific product
• The quantity dispensed
• The pharmacy
• Dispensing or professional fees
• Insurance coverage
• Your provincial or territorial coverage
• Whether a generic product is available

Metformin has been available as a generic medication for many years.

The Canadian market has also changed for semaglutide. Health Canada's Drug Product Database now lists marketed generic semaglutide products alongside Ozempic® products. If you're interested in current pricing, see our dedicated guide:

Which one is right for you?

There isn't a universal answer.

Medication selection depends on the individual's circumstances rather than simply choosing the medication that appears more familiar, more affordable or more convenient.

A practitioner may consider factors such as:

• Your health history
• Other medications you take
• Kidney function
• Your treatment goals
• How a medication is administered
• Potential medication interactions
• Cost and insurance coverage
• Other individual considerations

Diabetes Canada's current clinical guidance emphasizes that medication selection should take clinical priorities and individual factors into account.

This is why an online comparison can help you understand your options, but it cannot tell you which prescription medication is appropriate for you.

What should you ask your practitioner or pharmacist?

If you're comparing Ozempic® and metformin, useful questions include:

• What are the differences between these medications?
• How would each medication fit into my treatment plan?
• How is each medication taken?
• Are there any reasons one option may not be appropriate for me?
• Could my current medications affect the choice?
• What will my prescription cost?
• Is a generic product available?
• What should I know before starting or changing a prescription?

Having these questions ready can make your appointment more productive and help you understand why a particular medication has been prescribed.

Managing your prescriptions with Pocketpills

Once you have a prescription, managing your medication doesn't have to be complicated.

With Pocketpills, you can transfer an existing prescription to an online Canadian pharmacy and have your medications delivered to your home.

You can also access pharmacy support for questions about your prescriptions, including how to take your medication as directed.

Where available, Pocketpills also offers online assessments with licensed Canadian practitioners for people seeking prescription care.

Learn more about Pocketpills →

When should you speak with a practitioner?

Speak with a licensed Canadian practitioner if you're considering starting, stopping or changing a prescription medication.

Your practitioner can review your individual circumstances and determine what treatment approach may be appropriate.

Your pharmacist can also help you understand your prescription, answer questions about administration and explain how your medications fit into your overall medication regimen.‍

Frequently Asked Questions

Are Ozempic® and metformin the same medication?

No. Ozempic® contains semaglutide and belongs to the GLP-1 receptor agonist class. Metformin belongs to the biguanide class.

Why are Ozempic® and metformin compared?

They are different medications, but both can appear in discussions about prescription treatment plans. Comparing them can help explain how their active ingredients, medication classes, mechanisms and administration methods differ.

What is the biggest difference between Ozempic® and metformin?

The biggest differences are their active ingredients, medication classes and mechanisms of action. Ozempic® contains semaglutide and acts on GLP-1 receptors, while metformin is a biguanide that improves insulin sensitivity and reduces glucose production by the liver.

Is Ozempic® a pill like metformin?

No. Ozempic® is administered by subcutaneous injection, while metformin is taken orally.

Can Ozempic® and metformin be taken together?

A practitioner may prescribe both as part of an individual's treatment plan when appropriate. Whether they should be used together depends on the individual's circumstances and other medications.

Can you switch from metformin to Ozempic®?

A medication change should be discussed with your practitioner. They can determine whether a different treatment approach is appropriate and provide instructions for making any change safely.

Is metformin cheaper than Ozempic®?

The cost of either medication can vary. Metformin has generic products available, while generic semaglutide products are now also marketed in Canada. Your actual cost depends on the product, pharmacy, quantity, fees and insurance coverage.

Is there a generic version of Ozempic® in Canada?

Health Canada now lists marketed generic semaglutide products separately from Ozempic®. It is more accurate to refer to these as generic semaglutide products rather than “generic Ozempic®.”

How much does Ozempic® cost in Canada?

There isn't one universal Canadian price. The amount you pay can depend on the pharmacy, prescription quantity, dispensing fees and insurance coverage.

How do I know which medication is appropriate for me?

A licensed Canadian practitioner can review your health history, current medications and other relevant factors to determine what prescription treatment may be appropriate.