Study to assess the pharmacokinetics and dose proportionality of 1 mg, 2.5 mg and 5 mg tablets of linagliptin

Inclusion Criteria:

• Healthy male and female volunteers according to the following criteria: Based upon a complete medical history, including the physical examination, vital signs (Blood Pressure (BP), Pulse Rate (PR)), 12-lead ECG (electrocardiogram), clinical laboratory tests
• Age 18 to 55 years (inclusive)
• BMI (Body Mass Index) 18.5 to 29.9 kg/m2 (inclusive)
• Signed and dated written informed consent prior to admission to the study in accordance with Good Clinical Practice and the local legislation

Exclusion Criteria:

• Any finding of the medical examination (including BP, PR and ECG) deviating from normal and of clinical relevance. Repeated measurement of a systolic blood pressure greater than 140 mmHg or diastolic blood pressure greater than 90 mmHg
• Any evidence of a clinically relevant concomitant disease
• Gastrointestinal, hepatic, renal, respiratory, cardiovascular, metabolic, immunological or hormonal disorders
• Surgery of the gastrointestinal tract (except appendectomy)
• Diseases of the central nervous system (such as epilepsy) or psychiatric disorders or neurological disorders
• History of relevant orthostatic hypotension, fainting spells or blackouts
• Chronic or relevant acute infections
• History of relevant allergy/hypersensitivity (including allergy to drug or its excipients)
• Intake of drugs within one month or less than 10 half-lives of the respective drug prior to first study drug administration except if a relevant interaction can be ruled out
• Participation in another trial with an investigational drug within two months prior to administration or during the trial
• Smoker (> 10 cigarettes or > 3 cigars or > 3 pipes/day)
• Alcohol abuse ( average consumption of more than 20 g/day in females and 30 g/day in males)
• Drug abuse
• Blood donation (more than 100 mL within four weeks prior to administration or during the trial)
• Any laboratory value outside the reference range that is of clinical relevance
• Inability to comply with dietary regimen of trial site

For female subjects only:

• Positive pregnancy test, pregnancy or planning to become pregnant during the study or within 2 months after study completion
• No adequate contraception during the study and until 1 month after study completion, i.e. not any of the following: implants, injectables, combined oral contraceptives, IUD (intrauterine device), sexual abstinence for at least 1 month prior to enrolment, vasectomised partner (vasectomy performed at least 1 year prior to enrolment), or surgical sterilisation (including hysterectomy). Females, who do not have a vasectomised partner, are not sexually abstinent or surgically sterile will be asked to use an additional barrier method (e.g. condom, diaphragm with spermicide)
• Lactation