Primary objective:To study the absolute bioavailability, distribution and elimination parameters of flucloxacillin from two oral formulations of flucloxacillin in healthy male and/or female subjects.

A mono-center, open, randomized, three-way, twelve-sequence, cross-over study to determine the extent of absorption (absolute bioavailability), rate of absorption and to further characterize distribution and elimination characteristics of a commercial 250 mg and a 500 mg capsule of flucloxacillin each given as a single oral dose vs. one 250 or 500 mg intravenous dose to 24 healthy male and/or female subjects in the fasting state

Inclusion Criteria:

• Healthy volunteers,
• Caucasians,
• Body Mass Index (BMI) between 19 and 27 kg/m 2;
• physically and mentally healthy as judged by means of a medical and standard lab examination;
• non-smokers,
• ex-smokers or moderate smoker.

Exclusion criteria:

• medical history,
• vital signs,
• physical examination,laboratory tests (blood and/or urine) with evidence of clinically significant conditions;
• 12-lead electrocardiogram (ECG) with clinically significant abnormality;acute infection within 2 weeks preceding 1st study drug administration;any medication on a regular basis (exception females: oral contraceptives) and/or tricyclic antidepressants, antacids, histamine H2-receptor antagonists, antibiotics,
• non steroid anti-inflammatory drugs or anticoagulants within 8 weeks before the 1st study drug administration and/or no agreement to take any of those drugs including Over-the-counter (OTC) drugs until the end of the follow- up examination;
• no agreement not to take any medication,including OTC medicine, antacids, or analgesics within 2 weeks before 1st drug administration until the end of the follow-up examination;special diet or loss of > 5 kg within last month from a weight reduction diet; regularly consume of large quantities of alcohol (> 20g/day) and/or beverages containing methylxanthines e.g. caffeine (> 0.5L/day altogether);
• no agreement not to consume: - any beverages or foods containing alcohol 48 h prior to 1st study drug administration until end of the follow-up examination;
• any grapefruit products 7 days prior 1st study drug administration until end of the follow-up examination,
• any beverages or foods containing methylxanthines as well as fruit-juices and any foods containing poppy seed 48 h before 1st drug administration of either study period until last blood sample of the respective study period was collected,
• not to consume chewing during confinement;
• history of: - allergy to flucloxacillin,
• B-lactams and/or related drugs,
• known hypersensitivity against the inactive ingredients of the study medication,
• hypersensitivity to multiple drugs,
• allergic diseases,
• acute hay fever,
• previous history of flucloxacillin-associated jaundice/hepatic dysfunction,
• alcohol or drug abuse,
• epilepsy or other seizure,
• psychiatric illness, e.g. latent or manifest depression schizophrenia, or neurosis,
• respiratory diseases,
• surgery of the gastrointestinal tract (except appendectomy),
• kidney diseases,
• bleeding/coagulation disorder or severe anaemia,
• glucose-6-phosphate dehydrogenase deficiency and/or chronic treatment or chronic pathology;
• metabolic disease;
• evidence for disorder in the metabolism of pharmaceuticals or other foreign compounds; cardiovascular diseases e.g. hypertension, hypotension or bradycardia;
• associated disease that would interfere with the clinical course of the trial;
• major illness during 3 month before commencement of the screening period,
• gastrointestinal diseases;
• reported or positive results from test of drugs of abuse (amphetamines, opiates, barbiturate, methadone, cannabinoids, cocaine, benzodiazepines);
• Positive test for: alcohol, Hepatitis-B-antigen or Hepatitis-C-antibody, HIV-antibody;blood donor or blood loss including plasmapheresis within the last 3 months before the 1st study drug administration;
• intake of depot injectable solutions (including study medication) within 6 month before 1st study administration;
• intake of enzyme-inducing and/or organotoxic drugs within 4 weeks before 1st study drug administration;for females only: positive results from pregnancy tests;does not use or not agree to use adequate contraceptive methods during the study;
• lactating woman.