Intervention: metformin XR
Trial phase: Phase 4
SMILES: CN=C(N)N(C)C(=N)N.Cl
Sex: All
Age groups: Adult | Older Adult
Healthy volunteers: No
Participants at risk: 264
Group description: Subjects received Metformin XR tablets, orally QD at a dose of 500 mg for 1 week, and then the dose was increased with increments of 500 mg every week in the first 2 weeks to 1500 mg. After that, the dose was increased up to a maximum dose of 2000 mg for next 2 weeks and maintained at 2000 mg until Week 16.
Eligibility criteria:
Inclusion criteria:

Diagnosis of Type 2 diabetes mellitus before the screening visit based on the World Health Organization (WHO) diagnostic and classification criteria
HbA1c value of 7.0-10.0%, inclusive
Age ranging from 18 to 79 years, inclusive
Treatment-naive for oral antidiabetic agents (that is, had not received antidiabetic medication previously, or had received antidiabetic medication for at least 14 days and not within 1 month of enrolment)
Male, or non-pregnant, non-breastfeeding females
Body mass index (BMI) greater than or equal to (>=) 18.5 and less than (<) 35 kilogram per square meter (kg/m^2)
In the opinion of the investigator, subjects are well-motivated, capable and willing to continue the study treatment as required during the whole study period, maintain a study dietary, as required for this protocol, attend scheduled visits and be willing to receive phone calls between visits, avoid pregnancy by using an adequate method of contraception throughout the duration of the study for the female subjects of child bearing potential (and if appropriate male subjects with female partners of childbearing potential)
Written informed consent given before any trial-related activities are carried out

Exclusion criteria:

Type 1 diabetes
Previous treatment with insulin or other antidiabetics (including Chinese traditional medicine) for more than 14 days continuously or within 1 month of enrolment
Any of the protocol-specified cardiovascular conditions within 3 months prior to the screening visit
Impaired liver function as defined in the protocol
Serum creatinine values as specified in the protocol
Known proliferative retinopathy or maculopathy requiring acute treatment, or recurrent major hypoglycemia or hypoglycemic unawareness as judged by the investigator
Persistent uncontrolled hypertension
Severe chronic gastrointestinal disease
Previous history of 1 or more episodes of ketoacidosis or hyperosmolar state/coma
Currently receiving chronic (>14 days) systemic glucocorticoid therapy (excluding topical, intraocular, inhaled or intranasal preparations) or have received such therapy within 4 weeks of the screening visit
Current use of beta-blockers, thiazide diuretic, thyroid products, estrogens, oral contraceptives, phenytoin, nicotinic acid, sympathomimetics, nifedipine and isoniazid and cannot be replaced by any other treatment
Have any hematologic condition that may interfere with HbA1c measurement (for example, hemolytic anemia, sickle-cell disease)
Have any other condition (such as, known drug or alcohol abuse or a psychiatric disorder) that may prevent the subject from following and completing the protocol
Known hypersensitivity to Metformin Hydrochloride
Currently enrolled in, or discontinued within the last 30 days from, a clinical trial involving an investigational product or non-approved use of a drug or device, or concurrently enrolled in any other type of medical research judged not to be scientifically or medically compatible with this study
Any contraindications to Metformin according to local package insert