Guide to Prescribing and Titrating Gliclazide Therapy

Q: How does dosing time (breakfast vs evening meal) affect gliclazide’s blood glucose lowering pattern?

If given with breakfast it may lower blood glucose levels up to the evening meal. If given with the evening meal it may lower levels pre-bed and during night, so the time-action profile should be considered alongside diet and activity.

Q: How should gliclazide dose titration be guided to reach targets?

Use a blood glucose (BG) profile rather than HbA1c alone to account for daily variability and hypoglycaemia risk. If BG readings are consistently high from breakfast to evening, increase the morning dose; if high after evening meal and on waking, increase the evening dose, using increments of 40–80 mg depending on how far readings are above target.

Oct 4, 2026

Uploaded by Rainbow Cat

Guide to prescribing and titrating gliclazide therapy for type 2 diabetes, including background for add-on or first-line use, initiation with breakfast versus evening dosing, and dose starting recommendations. Covers hypoglycaemia risk management, blood glucose and HbA1c targets, and a titration approach using glucose profiles, dose increments, and review intervals. Includes testing, patient education topics such as driving and DVLA advice, contraindications and side-effect considerations, renal/hepatic impairment cautions, and expected weight change, with references and approvals.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages3

Reading Time8 min

AccessFree to download

Background for Use

Initiation

Initial Dose

Targets

Gliclazide Titration

When to Test

Contraindications and Side-Effects

Renal and Hepatic Impairment

Hypoglycaemia

Hypo’s and Driving

Weight Gain

References

| Guide to Prescribing and Titrating Gliclazide Therapy | | | --- | --- | | Background for Use: | | | Local diabetes guidelines recommend adding a second treatment when the HbA1c is >58mmols and the patient is on maximum tolerated mono-therapy. When starting a second therapy aim for an HbA1c target of < 53mmols/molHbA1c targets should be individualised (see targets below)
Gliclazide can also be used first-line if patient unable to tolerate Metformin or it is contra-indicated or if patient symptomatic with high HbA1c(Remember to add in Metformin at a later stage) .
Gliclazide can lower the HbA1c by 11mmol/mol on average.
There is considerable clinical experience of the efficacy and safety of gliclazide1 | | | Initiation: | | | Gliclazide works by directly stimulating insulin secretion, so has the potential for causing hypoglycaemia. It is important to consider the time-action profile of gliclazide together with information about the patient’s diet and activity.
If given with breakfast it will potentially lower blood glucose levels up to the evening meal.
If given with evening meal it will lower blood glucose levels pre bed and during night.
Onset 1-2 hours Peak 4-6 hours Half-life 8-12 hours
Time action profile gliclazide immediate release tablets

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Hours post oral ingestion
The starting dose is usually 80mgs with a meal but consider starting with 40mgs if there are any particular concerns about hypoglycaemia. A blood glucose profile will help you identify whether to initiate a dose with breakfast or the evening meal. | | | Initial Dose: Always with food Titrate to:
Maximum Dose: | 40-80mgs with one meal.
40-80mgs BD with breakfast and evening meal 160mgs BD | | Targets: | | | | --- | --- | --- | | Individual blood glucose (BG) targets may need to be agreed , especially for those where the risk of hypoglycaemia would cause significant problems or harm for example the frail elderly2
Remember: LOW HbA1c (<48mmols/mol) THINK HYPOGLYCAEMIA! It may be necessary to reduce or stop gliclazide.
For those patients not at risk titrate the dose to achieve target capillary BG levels or until maximum dose tolerated. Blood Glucose Target Levels: Aim for 5-7mmols fasting or pre-meal and <8.5mmol 2 hours post meal | | | | GliclazideTitration: | | | | An Hba1c is used as a guide to determine overall diabetes control, but is unable to indicate daily variability of BG levels or hypoglycaemia-so to titrate Gliclazide it is more appropriate to use a BG profile.
The BG profile and information regarding the patient’s activity and diet allows an informed decision to be made as to which dose needs to be adjusted.
Remember the time-action profile of Gliclazide:
If BG readings are consistently high from breakfast to the evening meal consider increasing the morning dose. If BG readings are high after evening meal and on waking consider increasing the evening dose.
Dose Increments:
Increments of 40-80mgs can be made depending on how high the BG levels are:
E.g. If fasting glucose levels are only just above target (7-9) you can titrate up by 40mgs, however if BG levels are all in double figures 80mgs would be more appropriate.
Initial Review: 4-6 weeks:
􀀹 To target-review again in 3 months thereafter 6 months
X Not to target-Increase dose and review 4-6 weeks
Follow-Up Review:
􀀹 To target-review again in 3 months thereafter 6 months
X Not to target-Increase dose and review 4-6 weeks | | | | When to Test: | | | | Refer to local leaflet: Patient Information on Home Blood Glucose Testing in Type 2 Diabetes.
[http://shared.bucksnet.nhs.uk](http://shared.bucksnet.nhs.uk)
Advise patient to return to routine testing when target is achieved or to seek advice if blood glucose readings not to target. | | | | Contraindications and Side–Effects: For full list see SPC | | | | | Renal and Hepatic Impairment

FAQs

When should gliclazide be added as a second treatment, and what HbA1c target should be used initially?

Local diabetes guidelines recommend adding a second treatment when HbA1c is >58 mmol/mol and the patient is on maximum tolerated mono-therapy. When starting second therapy, aim for an HbA1c target of <53 mmol/mol, and individualise targets as needed.

How does dosing time (breakfast vs evening meal) affect gliclazide’s blood glucose lowering pattern?

If given with breakfast it may lower blood glucose levels up to the evening meal. If given with the evening meal it may lower levels pre-bed and during night, so the time-action profile should be considered alongside diet and activity.

How should gliclazide dose titration be guided to reach targets?

Use a blood glucose (BG) profile rather than HbA1c alone to account for daily variability and hypoglycaemia risk. If BG readings are consistently high from breakfast to evening, increase the morning dose; if high after evening meal and on waking, increase the evening dose, using increments of 40–80 mg depending on how far readings are above target.

Oct 4, 2026

Uploaded by Rainbow Cat