This is a phase I, randomized, single-blind, parallel group, placebo-controlled, multi-cohort, first-in-human dose escalation study of a single IV 3-hour administration of Cilastatin as stand-alone in healthy male and female volunteers.

The study objectives are:

The evaluation of safety and tolerability of single intravenous doses of cilastatin in healthy volunteers administered as a 3-hour infusion.

The evaluation of the pharmacokinetic characteristics of Cilastatin after a single 3-hour infusion dose.

The study is designed as a phase I, randomized, single-blind, parallel group, placebo-controlled, multi-cohort, first-in-human dose escalation study of a single IV 3-hour administration of Cilastatin as stand-alone in healthy male and female volunteers.

The study will involve 24 healthy male and female healthy subjects, divided in three study cohorts (8 subjects per cohort). The study is a dose escalating study, starting from 3 g of Cilastatin administered intravenously in 3 hours.

Eight subjects will be randomized and assigned to either the study drug or placebo group for each study cohort in a 3:1 ratio (6 actives and 2 placebos). Randomization will also be gender balanced within each study cohort. The planned dose escalation scheme should not occur before participants in the previous dose level have been treated and safety profile of Cilastatin from those participants are assessed in accordande with the protocol.

Inclusion Criteria:

• Healthy male or female subjects, 18-45 years (inclusive) of age at the time of enrolment.
• Male and female subjects willing and able to give their written consent to participate in the trial after having received information about the study design, the objectives of the project, the possible derivative risks, and their right to withdraw from the study at any time and for any reason.
• Body weight within normal range (Quetelet's index between 19 and 30 expressed as kg/m2 and weigh at least 50 kg and no more than 100 kg inclusive).
• Normal clinical records and physical examination.
• Laboratory tests (hematology, biochemistry and urine analysis) within the range of normal values, per the Biochemistry laboratory reference values of the 'Hospital Universitario La Paz'. Variations may be admitted per the clinical criteria of the clinical investigator.
• Clinically acceptable temperature, blood pressure and pulse rate in supine and standing position (SBP between 100-140 mm Hg/ DBP between 50-90 mm Hg / HR between 50-100 bpm). Blood pressure and pulse will be measured after a minimum of 3 minutes of resting.
• To be able to understand the nature of the study and comply with all their requirements.

Exclusion Criteria:

• Women of childbearing potential who planned to become pregnant, were pregnant and/or breast-feeding, or did not wish to use an effective contraceptive method (hormonal contraceptives [implant, patches, oral]) or double-barrier methods [any double combination of: IUD, male or female prophylactics with spermicidal gel, diaphragm, contraceptive sponge, cervical cap]).
• History of alcohol dependence or drug abuse in the last 1 year or daily consumption of alcohol > 40 g/day for men or 24 g/day for women.
• Heavy consumer of stimulating beverages (>5 coffees, teas, chocolate or cola drinks per day).
• Background of allergy, idiosyncrasy or hypersensitivity to drugs.
• Intake of any medication within 4 days prior and during visit 2 or Xanthine containing foods or beverages or herbal remedies that could interfere with pharmacokinetics of the study drug, except allowed contraceptive medication for female subjects.
• Positive serology for hepatitis B, C or HIV.
• Background or clinical evidence of cardiovascular, respiratory, renal, hepatic, endocrine, gastrointestinal, haematological or neurological disease or other chronic diseases.
• Twelve lead ECG obtained at screening with PR ≥ 220 msec, QRS ≥120 msec and QTc ≥ 440 msec, bradycardia (<50 bpm) or clinically significant minor ST wave changes or any other abnormal changes on the screening ECG that would interfere with measurement of the QT interval.
• Having undergone major surgery during the previous 6 months.
• Smokers (refrained from any tobacco usage, including smokeless tobacco, nicotine patches, etc.) from 6 months prior to drug administration.
• Participation in another clinical trial during the 3 months preceding the drug administration.
• Donation of blood during the 4 weeks preceding the drug administration.
• Acute illness within four weeks before drug administration.
• Clinically significant abnormal laboratory values (as determined by the PI) at the screening evaluation.
• Existence of any surgical or medical condition which might interfere with the absorption, distribution, metabolism or excretion of the drug, i.e. impaired renal or hepatic function, diabetes mellitus, cardiovascular abnormalities, chronic symptoms of pronounced constipation or diarrhoea or conditions associated with total or partial obstruction of the urinary tract
• Positive results of the drugs at screening period or at visit 2. A minimum list of 6 drugs will be screened for inclusion: Amphetamines, Cocaine, Ethanol, Opiates, Benzodiazepines and Cannabinoids (positive results may be repeated at the discretion of the investigator team).