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Metformin - NICE guidance regarding renal function

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

  • NICE guidance states that:
    • start metformin treatment in a person who is overweight or obese (tailoring the assessment of body-weight-associated risk according to ethnic group ) and whose blood glucose is inadequately controlled by lifestyle interventions (nutrition and exercise) alone

    • metformin should be considered as an option for first-line glucose-lowering therapy for a person who is not overweight

    • metformin should be continued if blood glucose control remains or becomes inadequate and another oral glucose-lowering medication is added

    • the dose of metformin should be stepped up gradually over weeks to minimise risk of gastro-intestinal (GI) side effects. Consider a trial of extended-absorption metformin tablets where GI tolerability prevents continuation of metformin therapy

    • in adults with type 2 diabetes, review the dose of metformin if the estimated glomerular filtration rate (eGFR) is below 45 ml/minute/1.73m2:
      • Stop metformin if the eGFR is below 30 ml/minute/1.73m2
      • Prescribe metformin with caution for those at risk of a sudden deterioration in kidney function and those at risk of eGFR falling below 45ml/minute/1.73m2

    • benefits of metformin therapy should be discussed with a person with mild to moderate liver dysfunction or cardiac impairment so that:
    • due consideration can be given to the cardiovascular-protective effects of the drug (1)
    • an informed decision can be made on whether to continue or stop the metformin

NICE suggest targets for management of type 2 diabetes as (3)

Targets

  • for adults with type 2 diabetes managed either by lifestyle and diet, or by lifestyle and diet combined with a single drug not associated with hypoglycaemia, support the person to aim for an HbA1c level of 48 mmol/mol (6.5%)

  • for adults on a drug associated with hypoglycaemia, support the person to aim for an HbA1c level of 53mmol/mol (7.0%)

  • in adults with type 2 diabetes, if HbA1c levels are not adequately controlled by a single drug and rise to 58 mmol/mol (7.5%) or higher:
    • reinforce advice about diet, lifestyle and adherence to drug treatment and
    • support the person to aim for an HbA1c level of 53mmol/mol (7.0%)
    • and intensify drug treatment

  • consider relaxing the target HbA1c level on a case-by-case basis, with particular consideration for people who are older or frail, for adults with type 2 diabetes:
    • who are unlikely to achieve longer-term risk-reduction benefits, for example, people with a reduced life expectancy
    • for whom tight blood glucose control poses a high risk of the consequences of hypoglycaemia, for example, people who are at risk of falling, people who have impaired awareness of hypoglycaemia, and people who drive or operate machinery as part of their job
    • for whom intensive management would not be appropriate, for example, people with significant comorbidities

  • if adults with type 2 diabetes achieve an HbA1c level that is lower than their target and they are not experiencing hypoglycaemia, encourage them to maintain it. Be aware that there are other possible reasons for a low HbA1c level, for example, deteriorating renal function or sudden weight loss

HbA1c lower than target:

  • If adults with type 2 diabetes achieve an HbA1c level that is lower than their target and they are not experiencing hypoglycaemia, encourage them to maintain it. Be aware that there are other possible reasons for a low HbA1c level, for example, deteriorating renal function or sudden weight loss

Metformin is the usual first line therapy in type 2 diabetes management

  • assess the person's cardiovascular status and risk to determine whether they have chronic heart failure or established atherosclerotic cardiovascular disease or are at high risk of developing cardiovascular disease
  • based on the cardiovascular risk assessment for the person with type 2 diabetes:
    • if they have chronic heart failure or established atherosclerotic cardiovascular disease, offer an SGLT2 inhibitor with proven cardiovascular benefit in addition to metformin
    • if they are at high risk of developing cardiovascular disease, consider an SGLT2 inhibitor with proven cardiovascular benefit in addition to metformin

  • when starting an adult with type 2 diabetes on dual therapy with metformin and an SGLT2 inhibitor as first-line therapy, introduce the drugs sequentially, starting with metformin and checking tolerability. Start the SGLT2 inhibitor as soon as metformin tolerability is confirmed

  • gradually increase the dose of standard-release metformin over several weeks to minimise the risk of gastrointestinal side effects in adults with type 2 diabetes

  • if an adult with type 2 diabetes experiences gastrointestinal side effects with standard-release metformin, consider a trial of modified-release metformin

  • for first-line drug treatment in adults with type 2 diabetes, if metformin is contraindicated or not tolerated:
    • if they have chronic heart failure or established atherosclerotic cardiovascular disease, offer an SGLT2 inhibitor with proven cardiovascular benefit
    • if they are at high risk of developing cardiovascular disease, consider an SGLT2 inhibitor with proven cardiovascular benefit

  • for first-line drug treatment in adults with type 2 diabetes, if metformin is contraindicated or not tolerated and if they are not in either of the groups in when early introduction of an SGLT2 inhibitor should be considered/offered then:
    • a DPP-4 inhibitor or
    • pioglitazone or
    • a sulfonylurea or
    • an SGLT2 inhibitor for people who meet the criteria in NICE's technology appraisal guidance on canagliflozin, dapagliflozin and empagliflozin as monotherapies or ertugliflozin as monotherapy or with metformin for treating type 2 diabetes

  • before starting an SGLT2 inhibitor, check whether the person may be at increased risk of diabetic ketoacidosis (DKA), for example if:
    • they have had a previous episode of DKA
    • they are unwell with intercurrent illness
    • they are following a very low carbohydrate or ketogenic diet

  • address modifiable risks for DKA before starting an SGLT2 inhibitor. For example, for people who are following a very low carbohydrate or ketogenic diet, they may need to delay treatment until they have changed their diet

  • advise adults with type 2 diabetes who are taking an SGLT2 inhibitor about the need to minimise their risk of DKA by not starting a very low carbohydrate or ketogenic diet without discussing it with their healthcare professional, because they may need to suspend SGLT2 inhibitor treatment

 

Do not routinely offer self-monitoring of blood glucose levels for adults with type 2 diabetes unless:

  • the person is on insulin or
  • there is evidence of hypoglycaemic episodes or
  • the person is on oral medication that may increase their risk of hypoglycaemia while driving or operating machinery
  • or the person is pregnant, or
  • is planning to become pregnant. For more information, see the NICE guideline on diabetes in pregnancy

Notes:

  • LADA
    • patients with LADA are relatively 'insulin deficient' rather than 'insulin resistant'. These patients do not have the classic type 2 diabetic phenotype. These patients are likely to require insulin earlier in their management compared to 'insulin resistant' diabetics. Caution is required in management of these patients because insulin therapy may be indicated from diagnosis of diabetes in these patients if presenting with persistently high blood glucose values

Reference:


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