Metformin works by reducing the amount of sugar your liver releases into the blood and by helping your body respond better to insulin.
Navigating treatments for type 2 diabetes: How to know what’s right for you, right now
This article provides a topline overview to help people with type 2 diabetes begin discussions with their doctors. It is not a comprehensive document and not intended to replace the advice of a doctor or other healthcare professional.
Diet and exercise are not always enough
If you’ve read some of our other blog posts, you’ll know that diet and exercise are powerful tools to help manage type 2 diabetes. However, in the long term most people will find that their diabetes evolves, so that they also need medication on top of diet and exercise to keep the many aspects of their disease under control.
Medications use a range of approaches to lower blood sugar levels
Key organs involved in managing insulin and sugar levels that are potential targets for treatments
As discussed in this blog post, if you have type 2 diabetes, your body gradually stops making enough insulin and becomes less able to use the insulin it does make, effectively. The overall effect is that your blood sugar rises, becoming too high.
Diabetes medications try to bring your blood sugar under control by affecting how the body handles insulin and/or sugar.
All medicines can cause side effects in some people. If you do suffer from any, it’s worth talking to your doctor as there may be ways to manage the side effects, or there may be another medicine that could work better for you. Speak to your doctor to find out more.
People with type 2 diabetes should have their medications reassessed every 3–6 months. Are you on the right medication for you? Read on to find out more and be sure to discuss it with your doctor!
Step 1 on the medication map
Metformin is the first medicine that is generally prescribed to people with type 2 diabetes, who require medication in addition to diet and exercise to maintain their target blood sugar level. Metformin is the only medicine in the biguanide class and is taken orally as a tablet.
- Help to lower blood sugar through the day
- Some cardiovascular benefit [read on for more about diabetes and cardiovascular health]
- Common side effects include those of the gut, including diarrhea and nausea
- May not be suitable in people with kidney disease
Step 2 and beyond
For those without cardiovascular disease, heart failure or chronic kidney disease
If you don’t need any extra protection for your heart or kidneys and your blood sugars are well-controlled, you may be able to stay on metformin alone. If your diabetes evolves and metformin is not enough to control you blood sugar alone, your doctor can recommend another treatment option.
There are a range of other treatment options available. The other main groups of medications are described below and with a range of different combinations being possible, the medication map will be there to support you to navigate the treatments landscape!
DPP-4is are oral medicines that help increase the amount of insulin produced after eating, and reduce the amount of sugar released by the liver when it’s not needed. They also slow down digestion.
- May help to control appetite
- Common side effects include those of the gut, including diarrhea and nausea, and flu-like symptoms
These oral medicines increase the body’s sensitivity to insulin and can increase the amount of ‘good’ cholesterol in the blood too.
- Reduced blood pressure
- Increased levels of ‘good cholesterol’
- Weight gain
- Fluid retention
Sulfonylureas can be taken orally around a meal to simulate the production of insulin by the pancreas and increase the effectiveness of insulin in the body.
- Long history of use and familiar effectiveness and side effect profile to doctors
- Modest weight gain
- Low blood sugar (hypos)
GLP-1 RAs and SGLT2is
All though a diabetes doctor might prescribe one of these medicines to a range of different type 2 diabetes patients for a range of reasons, they may be particularly suited to people with cardiovascular disease, heart failure or chronic kidney disease and are discussed in the next section.
Taking cardiovascular disease, heart failure and chronic kidney disease into account
If you have read this blog post, you will know of the connection between type 2 diabetes and cardiovascular disease, which includes heart attacks and stroke (read more here). Preventing cardiovascular disease should therefore be a priority when considering with your doctor how to manage your type 2 diabetes. If you are at high risk of, or have already been diagnosed with cardiovascular disease, kidney disease and heart failure, a doctor might decide to add another medicine to metformin early on. This decision can be made even if metformin is working well to control your blood sugar levels.
A large study suggests that almost 1/3 of people with type 2 diabetes have cardiovascular disease.
Treatment with a medication from either the GLP-1 RA class or the SLGT2i class can reduce cardiovascular risk in suitable patients. For some people whose blood sugar levels remain high, it is possible to combine both classes of medication.
GLP-1 RAs can be given by a once-daily or once-weekly injection, under the skin or orally, depending on the medicine.
GLP-1 RA medicines work in a number of ways: they slow down food leaving your stomach and help reduce the amount of sugar released from your liver. When you blood sugar gets high, GLP-1 RAs also increase the amount of insulin released by your pancreas. Read more about GLP-1 treatment in this blog post.
- Promotes weight loss
Cardiovascular risk reduction
- Particular recommendation for those with cardiovascular disease or at high risk of cardiovascular disease, especially stroke and heart attacks
- Side effects include those of the gut, including diarrhea and nausea and dizziness
SGLT2is are oral medicines. These medications work to reduce blood sugars by preventing the kidneys from reabsorbing sugar back into the blood and therefore increasing the amount of sugar lost in the urine.
- Reduced blood pressure and weight loss
Cardiovascular risk reduction
- Particular recommendation for those with heart failure or chronic kidney disease [read on for more about diabetes and cardiovascular health]
- Increased chance of urinary and genital infections
- May not be suitable in people with some types of kidney disease
If your blood sugars end up not being controlled on metformin and a GLP-1 RA, you may be prescribed an SGLT2i in addition, or vice versa. Alternatively, you can even be prescribed one of the other treatment options for type 2 diabetes.
As insulin is the hormone at the center of diabetes, it comes as no surprise that different insulins can also be used to treat type 2 diabetes. This blog post is all about the available insulin treatment options available and how they can be tailored to different people’s needs.
- Can lower blood sugar to almost any desired level (depending on the amount you give)
- Many different types and durations of action
- Weight gain
- Requires ongoing monitoring of blood sugar levels
- Low blood sugar (hypos)
We hope that this blog post has given you an idea of just how many diabetes medicines are out there – when you consider the range of ways they can be combined, you can see there are a lot of possibilities! So, wherever you are with your diabetes, why not talk to your doctor to make sure that you are on the medication that can best support you at this time?
1. NHS.UK. Understanding medicine: Type 2 diabetes [online] August 2020. Available from: https://www.nhs.uk/conditions/type-2-diabetes/understanding-medication/ [Last accessed: June 2021].
2. Feingold KR, et al., editors. Oral and Injectable (Non-Insulin) Pharmacological Agents for Type 2 Diabetes [online] July 2020. South Dartmouth (MA): MDText.com, Inc.; 2000-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK279141/ [Last accessed: June 2021].
3. Galicia-Garcia U, et al. Int J Mol Sci 2020;21(17):6275.
4. Buse JB, et al. Diabetes Care. 2020;43(2):487-493.
5. Davies MJ, et al. Diabetes Care. 2018;41(12):2669-2701.
6. NHS.UK Metformin [online] February 2019. Available from: https://www.nhs.uk/medicines/metformin/ [Last accessed: June 2021].
7. Diabetes.co.uk. Incretin Mimetics (GLP-1 Agonists) [online] January 2019. Available from: https://www.diabetes.co.uk/diabetes-medication/incretin-mimetics.html [Last accessed: June 2021].
8. Diabetes.co.uk. DPP-4 Inhibitors (Gliptins) [online] January 2019. Available from: https://www.diabetes.co.uk/diabetes-medication/dpp-4-inhibitors.html [Last accessed: June 2021].
9. Diabetes.co.uk. Thiazolidinediones (Glitazones) [online] January 2019. Available from: https://www.diabetes.co.uk/diabetes-medication/thiazolidinediones.html [Last accessed: June 2021].
10. Diabetes.co.uk. Sulphonylureas [online] January 2019. Available from: https://www.diabetes.co.uk/diabetes-medication/sulphonylureas.html [Last accessed: June 2021].