Drug Interaction With Proton Pump Inhibitors for Nifedipine ER Tablets

Inclusion Criteria: 1. Healthy, males and non-pregnant female volunteers, 18 to 55 years of age, inclusive. 2. Smoking status: Only non-tobacco/nicotine users (for at least 6 months prior to the clinical study) will be eligible to participate in this study. 3. BMI that is within 18.5-35.0 kg/m², inclusive. 4. Healthy, according to the medical history, ECG, vital signs, laboratory results and physical examination as determined by the PI/Sub-Investigator. 5. Ability to comprehend and be informed of the nature of the study, as assessed by BPSI staff. Capable of giving written informed consent prior to receiving any study procedure. Must be able to communicate effectively with clinic staff. 6. Ability to fast for at least 14 hours. 7. Availability to volunteer for the entire study duration and willing to adhere to all protocol requirements. 8. Female subjects must fulfill at least one of the following: * Be surgically sterile for a minimum of 6 months; * Post-menopausal for a minimum of 1 year; * Agree to avoid pregnancy and use medically acceptable method of contraception from at least 30 days prior to the study until 30 days after the study has ended (last study procedure). Medically acceptable methods of contraception include non-hormonal contraceptives, intrauterine device, or double barrier method (condom with foam or vaginal spermicidal suppository, diaphragm with spermicide). Complete abstinence alone can be used as a method of contraception. Exclusion Criteria: 1. Known history or presence of any clinically significant hepatic, renal/genitourinary, gastrointestinal (e.g., gastrointestinal obstruction, gastrointestinal ulcers), cardiovascular (e.g., severe obstructive coronary artery disease, myocardial infarction, angina, heart failure), cerebrovascular, pulmonary, endocrine, immunological, musculoskeletal, neurological, psychiatric, dermatological or hematological disease or condition unless determined as not clinically significant by the PI/Sub-Investigator. 2. Clinically significant history or presence of any clinically significant gastrointestinal pathology (e.g. chronic diarrhea, inflammatory bowel disease), unresolved gastrointestinal symptoms (e.g. diarrhea, vomiting, swallowing disorder), or other conditions known to interfere with the absorption, distribution, metabolism or excretion of the drug experienced within 7 days prior to first dosing, as determined by the PI/Sub-Investigator. 3. QTc interval \> 430 milliseconds for males and \> 450 milliseconds for females, unless deemed otherwise by the PI/Sub-Investigator. 4. Abnormal clinical laboratory values, unless values are deemed by the PI/Sub-Investigator as "Not Clinically Significant". 5. Hemoglobin values less than 11.5 g/dl. 6. Abnormal vital signs (blood pressure \[BP\], heart rate \[HR\], respiratory rate \[RR\] and temperature) measurements, unless deemed otherwise by the PI/Sub-Investigator. 7. Presence of any clinically significant illness within 30 days prior to first dosing, as determined by the PI/Sub-Investigator. 8. Presence of any significant physical or organ abnormality as determined by the PI/Sub-Investigator. 9. Individuals who have implanted or portable electro-mechanical medical device such as a cardiac pacemaker, defibrillator or infusion pump. 10. A positive test result for any of the following: HIV, Hepatitis B surface antigen, Hepatitis C, drugs of abuse (marijuana, amphetamines, barbiturates, cocaine, opiates, phencyclidine and benzodiazepines), alcohol test and cotinine. Positive pregnancy test for female subjects. 11. Known history or presence of: * Alcohol abuse or dependence within one year prior to first study period; * Drug abuse or dependence; * Hypersensitivity or idiosyncratic reaction to nifedipine, omeprazole/sodium bicarbonate, its excipients, and/or related substances; * Hypotension; * Bartter's syndrome; * Gastric bezoar; * Crohn's disease or diverticulitis; * severe dysphagia to food or pills; * Food allergies and/or presence of any dietary restrictions; * Severe allergic reactions (e.g. anaphylactic reactions, angioedema). 12. History of intolerance to and/or difficulty with blood sampling through venipuncture. 13. Abnormal diet patterns (for any reason) during the four weeks preceding the study, including fasting, high protein diets, vegan, etc. 14. Individuals who have donated, in the days prior to first study period: * 50-499 mL of blood in the previous 30 days; * 500 mL or more in the previous 56 days. 15. Donation of plasma by plasmapheresis within 7 days prior to first study period. 16. Individuals who have participated in another clinical trial or who received an investigational drug within 30 days prior to first study period. 17. Use of any enzyme-modifying drugs and/or other products, including strong inhibitors of cytochrome P450 (CYP) enzymes (e.g. cimetidine, fluoxetine, quinidine, fluconazole, ketoconazole, voriconazole, itraconazole, clarithromycin, erythromycin, nefazodone, atazanavir, saquinavir, indinavir, and nelfinavir) and strong inducers of CYP enzymes (e.g. barbiturates, carbamazepine, glucocorticoids, phenytoin, St. John´s Wort and rifampin) in the previous 30 days before first study period. 18. Use of drugs such as, proton pump inhibitors, clopidogrel, tacrolimus, digoxin, cyclosporine, disulfiram, benzodiazepines, diazepam, warfarin, methotrexate, iron salts, erlotinib, and mycophenolate mofetil (MMF) in the previous 30 days before first study period, or individuals with vitamin B-12 deficiency (as long-term dosing (more than 3 years) of omeprazole/sodium bicarbonateZegerid may lead to vitamin B-12 deficiency) 19. Individuals having undergone gastrointestinal (GI) surgery within 3 months prior to first study period, unless deemed otherwise by PI/Sub-Investigator. 20. Use of any prescription medication within 14 days prior to first study period (except for contraceptives). 21. Use of any over-the-counter medications (including oral multivitamins, herbal and/or dietary supplements and/or teas) within 14 days prior to first study period (except for spermicidal/barrier contraceptive products). 22. Consumption of food or beverages containing grapefruit and grapefruit juice and/or pomelo within 10 days prior to first study period. 23. Consumption of food or beverages containing caffeine/methylxanthines, poppy seeds and/or alcohol within 48 hours before dosing. 24. Use of diuretics (drugs or food, see Appendix D) within 24 hours before dosing of SmartPillTM. 25. Individuals having undergone any major surgery within 6 months prior to the start of the study, unless deemed otherwise by PI/Sub-Investigator. 26. Difficulty with swallowing whole tablets or large capsules. 27. Have had a tattoo or body piercing within 30 days prior to first study period and during the study.