Evaluating drug excretion in breast milk after cimetidine administration

Is this trial a fit for you?

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This study investigates how the drug cimetidine is excreted in breast milk among healthy postpartum women. Participants will receive a single oral dose of cimetidine at three different postpartum time points, with blood, urine, and breast milk samples collected for analysis. The study aims to assess the expression and activity of specific transporters in the mammary gland, using each participant as their own control. Genotyping for OCT1 and BCRP will also be performed to understand genetic influences on drug transport.

Why it matters

Who can join: the full rules

Inclusion criteria

1. Healthy postpartum women
2. 18-50 years of age and their infants
3. Able to provide written informed consent

Exclusion criteria

1. Receiving cimetidine within the 3 days prior to each study day. Concomitant administration of cimetidine will confound interpretation of study results.
2. Hypersensitivity to cimetidine Patients with known allergic reactions to cimetidine will be excluded for safety reasons
3. Receiving medication known to interact with cimetidine: OCT, BCRP, CYP3A4, CYP2D6, CYP1A2 and CYP2C9 substrates (e.g. amiodarone, clopidogrel, diazepam, ketoconazole, metformin, nifedipine, phenytoin, procainamide, theophylline,tricyclic antidepressants and warfarin) Patients with drug interactions will be excluded for safety reasons.
4. Receiving BCRP inhibitors/inducers (afatinib, aripipraxole, axitinib, cimetidine, cyclosporine, curcumin/tumeric, delavirdine, efavirenz, elacridar, elvitegravir, etravirine, FTC, 5-fluorouracil, fluvastatin, imatinib, lanzoprazole, lapatinib, lopinavir, maraviroc, nelfinavir, nebicapone, nilotinib, novobiocin, oltipraz, omeprazole, pantoprazole, phenobarbital, promazine, rabeprazole, riboflavin, rifampicin, risperidone, saquinavir, sirolimus, sorafenib, sulfasalazine, sunitinib, tacrolimus, tariquidar, telaprevir, telatinib, teriflunomide, tolcapone, triflunomide, trametinib, trifluoperazine, venlafaxine, zidonuvir), OCT1 inhibitors/inducers (acyclovir, amantadine, amiloride, amitriptyline, bucindolol, carvedilol, chlorpheniramine, chlorpromazine, cimetidine, citalopram, clonidine, clopidogrel, clotrimazole, clozapine, cocaine, corticosterone, cyclosporine, daclatasvir, darunavir, desipramine, dextromethorphan, diltiazem, disopyramide, dronedarone, efavirenz, famotidine, fentanyl, fluvoxamine, formoterol, fuloxetine, griseofulvin, doxazosine, ganciclovir, guanfacine, imipramine, indinavir, isavuconazole, itraconazole, ketoconazole, lamotrigine, lasmiditan, levofloxacin, levomepromazine, lidocaine, maprotiline, methylnicotinamide, morphine, moxifloxacin, nefazodone, nelfinavir, nevirapine, nicotine, nomifensine, ondansetron, oxybutynin, paroxetine, pentamidine, phenoxybenzamine, prazosin, probenecid, procainamide, propafenone, pyrazinamide, quetiapine,quinidine, quinine, reboxetine, remoxidpride, reseripine, rifampicin, ritonavir, salmeterol, saquinavir, tramadol, trimethoprim, trimipramine, verapamil) Inhibitors and inducers of the drug transporters will confound data analysis and interpretation.
5. Kidney disease could confound data analysis and interpretation. Therefore, patients with known kidney disease with documented renal function impairment will be excluded from the study. Current serum creatinine \> 1.2 mg/dL in their medical record will be excluded.
6. Known liver disease Liver disease will confound data analysis and interpretation. Therefore, patients with known significant liver disease will be excluded from the study. Current ALT exceeding 2-times the upper limit of normal in their medical record will be excluded.
7. Inability to fast for 4 hours prior to the study. To limit PK variability across study days, subjects will be requested to fast for 4 hours prior to each study day.
8. Smokers (tobacco or other nicotine containing products Nicotine interacts with OCT1 and will confound data analysis and interpretation

Where it's running

• University of Washington
  Seattle, Washington, United States Recruiting

Study contacts

• Principal investigator: Mary Hebert, PharmD, FCCP — University of Washington
• Study coordinator: Mary Hebert, PharmD, FCCP
• Email: mhebert@uw.edu
• Phone: 206-616-5016

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How to take part

1. Review the eligibility criteria above with your treating physician.
2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.