Dosage & Administration
Modified release preparation: Always take this medicine exactly as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure. The dose is determined by the doctor, depending on your blood and possibly urine sugar levels. Change in external factors (weight reduction, lifestyle, stress) or improvements in the blood sugar control may require changed gliclazide doses.
The recommended daily dose is one to four tablets (maximum 120 mg) in a single intake at breakfast time. This depends on the response to treatment. Gliclazide MR tablet is for oral use. Take your tablet(s) with a glass of water at breakfast time (and preferably at the same time each day). Swallow your whole tablet(s) in one piece. Do not chew or crush. You must always eat a meal after taking your tablet(s).
If a combination therapy of gliclazide with metformin, an alpha-glucosidase inhibitor, a thiazolidinedione, a dipeptidyl peptidase-4 inhibitor a GLP-1 receptor agonist or insulin is initiated your doctor will determine the proper dose of each medicine individually for you. If you notice that your blood sugar levels are high although you are taking the medicine as prescribed, you should contact your doctor or pharmacist.
If you take more Gliclazide tablets than you should: If you take too many tablets, contact your doctor or the nearest hospital Accident & Emergency department immediately. The signs of overdose are those of low blood sugar (hypoglycaemia). The symptoms can be helped by taking sugar (4 to 6 lumps) or sugary drinks straight away, followed by a substantial snack or meal. If the patient is unconscious immediately inform a doctor and call the emergency services. The same should be done if somebody, (for instance a child), has taken the product unintentionally. Unconscious patients must not be given food or drink. It should be ensured that there is always a pre-informed person that can call a doctor in case of emergency.
If you forget to take Gliclazide tablet: It is important to take your medicine every day as regular treatment works better. However, if you forget to take a dose of Gliclazide MR tablet, take the next dose at the usual time. Do not take a double dose to make up for a forgotten dose.
If you stop taking Gliclazide MR tablet: As the treatment for diabetes is usually lifelong, you should discuss with your doctor before stopping this medicinal product. Stopping could cause high blood sugar (hyperglycaemia) which increases the risk of developing complications of diabetes. If you have any further questions on the use of this product, ask your doctor or pharmacist.
The blood sugar lowering effect of gliclazide may be strengthened and signs of low blood sugar levels may occur when one of the follow ng medicines is taken:
- other medicines used to treat high blood sugar (oral antidiabetics, GLP-1 receptor agonists or insulin),
- antibiotics (sulphonamides, clarithromycin)
- medicines to treat high blood pressure or heart failure (beta-blockers. ACE-inhibitors such as captopril, or enalapril)
- medicines to treat fungal infections (miconazole, fluconazole)
- medicines to treat ulcers in the stomach or duodenum (H2 receptor antagonists),
- medicines to treat depression (monoamine oxidase inhibitors)
- painkiller or antirheumatics (phenylbutazone, ibuprofen)
- medicines containing alcohol
The blood-glucose-lowering effect of gliclazide may be weakened and raised blood sugar levels may occur when one of the following medicines is taken:
- medicines to treat disorders of the central nervous system (chlorpromazine)
- medicines reducing inflammation (corticosteroids)
- medicines to treat asthma or used during labour (intravenous salbutamol, ritodrine and terbutaline)
- medicines to treat breast disorders, heavy menstrual bleeding and endometriosis (danazol)
- St John’s Wort- Hypericum perforatum- preparations
Blood glucose disturbance (low blood sugar and high blood sugar) can occur when a medicine belonging to a class of antibiotics called fluoroquinolones is taken at the same time as gliclazide especially in elderly patients.
Gliclazide may increase the effects of medicines that reduce blood clotting (warfarin).
Consult your doctor before you start taking another medicinal product. If you go into hospital tell the medical staff you are taking gliclazide.
Gliclazide with food and drink: Gliclazide can be taken with food and non-alcoholic drinks. Drinking alcohol is not recommended as it can alter the control of your diabetes in an unpredictable manner.
Driving and using machines: Your ability to concentrate or react may be impaired if your blood sugar is too low (hypoglycaemia), or too high (hyperglycaemia) or if you develop visual problems as a result of such conditions. Bear in mind that you could endanger yourself or others (for instance when driving a car or using machines). Please ask your doctor whether you can drive a car if you:
- have frequent episodes of low blood sugar (hypoglycaemia)
- have few or no warning signals of low blood sugar (hypoglycaemia)
Gliclazide contains lactose. If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicine.
- if you are allergic to gliclazide or to other medicines of the same group (sulfonylurea), or to other related medicines (hypoglycaemic sulfonamides)
- if you have insulin-dependent diabetes (type 1)
- if you have ketone bodies and sugar in your urine (this may mean you have diabetic ketoacidosis), a diabetic pre-coma or coma
- if you have severe kidney or liver disease
- if you are taking medicines to treat fungal infections
- if you are breastfeeding
Liver disorders: There have been isolated reports of abnormal iiver function, which can cause yellow skin and eyes. If you get this, see your doctor immediately. The symptoms generally disappear if the medicine is stopped. Your doctor will decide whether to stop your treatment.
Skin disorders: Skin reactions such as rash, redness, itching, hives, blisters, angioedema (rapid swelling of tissues such as eyelids, face, lips, mouth, tongue or throat that may result in breathing difficulty) have been reported. Rash may progress to widespread blistering or peeling of the skin. If you develop this, stop taking, seek urgent advice from a doctor and tell him that you are taking this medicine. Exceptionally, signs of severe hypersensitivity reactions have been reported: initially as flu-like symptoms and a rash on the face then an extended rash with a high temperature.
Blood disorders: Decrease in the number of cells in the blood (e.g. platelets, red and white blood cells) which may cause paleness, prolonged bleeding, bruising, sore throat and fever have been reported. These symptoms usually vanish when the treatment is discontinued.
Digestive disorders: Abdominal pain, nausea, vomiting, indigestion, diarrhoea, and constipation. These effects are reduced when Gliclazide is taken with a meal as recommended.
Eye disorders: Your vision may be affected for a short time especially at the start of treatment. This effect is due to changes in blood sugar levels.
As for another sulfonylurea, the following adverse events have been observed: cases of severe changes in the number of blood cells and allergic inflammation of the wall of blood vessels, reduction in blood sodium (hyponatraemia), symptoms of liver impairment (for instance jaundice) which in most cases disappeared after withdrawal of the sulfonylurea, but may lead to life-threatening liver failure in isolated cases.
Reporting of side effects: If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. By reporting side effects, you can help provide more information on the safety of this medicine.
Pregnancy & Lactation
Precautions & Warnings
Low blood sugar (Hypoglycaemia) may occur:
- if you take meals irregularly or skip meals altogether,
- if you are fasting
- if you are malnourished
- if you change your diet
- if you increase your physical activity and carbohydrate intake does not match this increase,
- if you drink alcohol, especially in combination with skipped meals,
- if you take other medicines or natural remedies at the same time,
- if you take too high doses of gliclazide,
- if you suffer from particular hormone-induced disorders (functional disorders of the thyroid gland, pituitary gland or adrenal cortex),
- if your kidney function or liver function is severely decreased.
if you have low blood sugar you may have the following symptoms: headache, intense hunger, nausea, vomiting, weariness, sleep disorders, restlessness, aggressiveness, poor concentration, reduced alertness and reaction time, depression, confusion, speech or visual disorders, tremor, sensory disturbances, dizziness and helplessness.
The following signs and symptoms may also occur: sweating, clammy skin, anxiety, fast or irregular heartbeat, high blood pressure, sudden strong pain in the chest that may radiate into nearby areas (angina pectoris).
If blood sugar levels continue to drop you may suffer from considerable confusion (delirium), develop convulsions, lose self-control, your breathing may be shallow and your heartbeat slowed down, you may become unconscious.
In most cases the symptoms of low blood sugar vanish very quickly when you consume .some form of sugar, (for instance, glucose tablets, sugar cubes, sweet juice, sweetened tea).
You should therefore always carry some form of sugar with you (glucose tablets, sugar cubes). Remember that artificial sweeteners are not effective. Please contact your doctor or the nearest hospital if taking sugar does not help or if the symptoms recur.
Symptoms of low blood sugar may be absent, less obvious or develop very slowly or you are not aware in time that your blood sugar level has dropped. This may happen if you are an elderly patient taking certain medicines (for instance those acting on the central nervous system and beta-blockers).
If you are in stressful situations (e.g. accidents, surgical operations, fever etc.) your doctor may temporarily switch you to insulin therapy.
Symptoms of high blood sugar (hyperglycaemia) may occur when gliclazide has not yet sufficiently reduced the blood sugar when you have not complied with the treatment plan prescribed by your doctor if you take St. John’s Wort (Hypericum perforatum) preparations or in special stress situations. These may include thirst, frequent urination, dry mouth, dry itchy skin, skin infections and reduced performance.
Blood glucose disturbances (low blood sugar and high bold sugar) can occur when Gliclazide is prescribed at the same time as medicines to a class of antibiotics called fluoroquinolone, especially in elderly patients. In this case, your doctor will remind you of the importance of monitoring your blood glucose.
If you have a family history of or know you have the hereditary condition glucose-6-phosphate dehydrogenase (G6PD) deficiency (abnormality of red blood cells), lowering of the haemoglobin level and breakdown of red blood cells (haemolytic anaemia) can occur. Contact your doctor before taking this medicinal product.
Gliclazide is not recommended for use in children due to lack of data.