Pharmacokinetic Interaction Between Trospium With an Inhibitor of OCT1 and of P-gp in Subjects Genotyped for OCT1
Pharmacokinetic Interaction Between Trospium With an Inhibitor of OCT1 and of P-gp in Subjects Genotyped for OCT1
The purpose of the study is:

 -  to determine absolute bioavailability, input rates, distribution volume, renal and
 intestinal excretion of trospium in subjects with wild-type of SLC22A1 rs72552763 and
 rs12208357 and in subjects with homozygous variant alleles of SLC22A1 rs72552763 or
 rs12208357

 -  to determine absolute bioavailability, input rates, distribution volume and renal and
 intestinal excretion of trospium in subjects with wild-type alleles of SLC22A1
 rs72552763 and rs12208357 after co-medication of 300 mg of the OCT1- inhibitor
 ranitidine

 -  to determine absolute bioavailability, input rates, distribution volume and renal and
 intestinal excretion of trospium in subjects with wild-type alleles of SLC22A1
 rs72552763 and rs12208357 after co-medication of 500 mg of the P-glycoprotein- inhibitor
 clarithromycin

 -  to determine absolute bioavailability, input rates, distribution volume and renal and
 intestinal excretion of trospium in subjects with homozygous variant alleles of SLC22A1
 rs72552763 or rs12208357 after co-medication of 500 mg of the P-glycoprotein- inhibitor
 clarithromycin.
Inclusion Criteria:

 -  ethnic origin: Caucasian

 -  genotypes of OCT1: wild-type and homozygous variant alleles of SLC22A1 rs72552763 or
 rs12208357.

 -  body mass index: ≥ 18.5 kg/m² and ≤ 30 kg/m²

 -  good health as evidenced by the results of the clinical examination, ECG, and the
 laboratory check-up, which are judged by the clinical investigator not to differ in a
 clinical relevant way from the normal state (blood pressure between 110/70 and 140/90
 for males and between 100/60 and 140/90 for females, heart rate over 50 bpm up to 90
 bpm, laboratory values within the reference ranges as given actually by the laboratory
 and stored in the TMF)

 -  written informed consent

 Exclusion Criteria:

 -  hepatic and renal diseases and/or pathological findings, which might interfere with
 pharmacokinetics and pharmacodynamics of the study medication (e.g. hepatic or renal
 dysfunction, obstruction of the urine flow with urinary retention by subvesical
 obstruction like benign prostatic hyperplasia, infections or tumors of the urinary
 tract)

 -  organic causes for polydipsia and pollakiuria

 -  existing cardiac or hematological diseases and/or pathological findings, which might
 interfere with the drug's safety, tolerability and/or pharmacokinetics (e.g.
 tachycardia, tachyarrhythmia, bradycardia, heart failure, coronary heart disease,
 disturbance of the stimulus conduction)

 -  pneumonia

 -  pharyngitis

 -  acute phorphyria

 -  hyperthyroidism

 -  galactose-intolerance, lactase deficiency or glucose-galactose malabsorption

 -  electrolyte disturbance

 -  gastrointestinal diseases and/or pathological findings (e.g. hiatus hernia with
 gastroesophageal reflux, stenosis, ulcera, severe chronic inflammatory bowel disease
 like ulcerative colitis or Crohn's disease, toxic megacolon), which might interfere
 with pharmacokinetics and pharmacodynamics of the study medication)

 -  autonomic neuropathy

 -  myasthenia gravis

 -  narrow-angle glaucoma

 -  drug or alcohol dependence

 -  positive drug or alcohol screening

 -  smokers of 10 or more cigarettes per day

 -  positive results in HIV, HBV and HCV screenings

 -  subjects who are on a diet which could affect the pharmacokinetics of the drugs (e. g.
 vegans, vegetarians)

 -  heavy tea or coffee drinkers (more than 1L per day)

 -  lactation, pregnancy test positive or not performed or women of child-bearing age
 without safe contraception as stated in the Note for Guidance on Non-clinical Safety
 Studies for the Conduct of Human Clinical Trials for Pharmaceutical (CPMP/ICH/286/95
 modifications: implants, injectables, combined oral contraceptives, IUDs, sexual
 abstinence or vasectomised partner and barrier-methods only in combination with one of
 the aforementioned)

 -  subjects suspected or known not to follow instructions of the clinical investigators

 -  subjects who are unable to understand the written and verbal instructions, in
 particular regarding the risks and inconveniences they will be exposed to as a result
 of their participation in the study

 -  subjects liable to orthostatic dysregulation, fainting, or blackouts

 -  participation in a clinical trial during the last 3 months prior to the start of the
 study

 -  less than 14 days after last acute disease

 -  less than 3 months after last blood donation

 -  any medication within 4 weeks prior to the intended first administration of the study
 medication which might influence functions of the gastrointestinal tract (e.g.
 laxatives, metoclopramide, loperamide, antacids, H2-receptor antagonists, proton pump
 inhibitors, anticholinergics)

 -  any other medication within two weeks prior to the first administration of the study
 medication, but at least 10-time the half-live of the respective drug (except oral
 contraceptives)

 -  intake of grapefruit or orange containing food or beverages within 14 days prior to
 administration of the study medication

 -  intake of poppy seed containing food or beverages within 14 days prior to
 administration of the study medication

 -  known allergic reactions to the active ingredients used, other H2-receptor
 antagonists, macrolide antibiotics or to constituents of the study medication