Relative Bioavailability Trial of L-Praziquantel in Healthy Volunteers

Inclusion criteria

• Healthy males aged 18-55 years of age (inclusive at screening)
• Male subjects with partners of childbearing potential must have had a vasectomy or use acceptable methods of birth control (that is, condoms) and not donate sperm during, and until 90 days after the last dose of the trial medication
• Written informed consent prior to any trial related procedure
• Have a body weight of greater than or equal to (>=) 55.0 kilogram (kg) to less than (<) 95.0 kg and a body mass index (BMI) of 18.5 to 29.9 kilogram per square meter (kg/m^2) (inclusive)
• Able to communicate well with the Investigator, understanding the protocol requirements and restrictions, and willing to comply with the requirements of the entire trial
• Non-smoker (= 0 cigarettes, pipes, cigars or others) since at least 3 months
• Electrocardiogram (ECG) recording (12-lead) without signs of clinically relevant pathology in particular corrected QT Interval (QTc) (Bazett) < 450 milliseconds (ms)
• Vital signs (systolic and diastolic blood pressure, pulse) in supine position and body temperature within the normal range or showing no clinically relevant deviation as judged by the medical Investigator

Exclusion criteria

• Any surgical or medical condition, including findings in the medical history or in the prestudy assessments, or any other significant disease, that in the opinion of the Investigator, constitutes a risk or a contraindication for the participation of the subject in the study or that could interfere with the study objectives, conduct or evaluation
• History of surgery of the gastrointestinal tract (GI), history of other GI tract diseases, or acute GI tract infections in the last 2 weeks, which could influence the GI absorption and/or motility according to the Investigator's opinion
• Any clinically relevant abnormality in the safety laboratory parameters as judged by the Investigator
• Have positive results from serology examination for Hepatitis B surface antigen (HBsAg), Hepatitis C Virus (HCV) or Human Immunodeficiency Virus (HIV)
• Allergy: ascertained or presumptive hypersensitivity to the active drug substance and/or formulations ingredients; history of anaphylaxis to drugs or allergic reactions in general, which the Investigator considers may affect the outcome of the trial
• History or presence of drug abuse (amphetamines, barbiturates, benzodiazepines, cocaine, opiates, phencyclidine (phenylcyclohexalpiperidine), tetrahydrocannabinol, tricyclic antidepressants, methadone, methamphetamine, oxycodone and propoxyphene) or alcohol abuse at screening and on each admission as defined by the Investigator
• Loss or donation of more than 400 milliliter (mL) of blood within 90 days prior to first praziquantel (PZQ) administration
• Administration of any investigational product or use of any investigational device within 60 days prior to first PZQ administration
• Subjects who have used drugs that may affect the pharmacokinetics (PK) of PZQ from 14 days before dosing until the last PK sample, for example, phenytoin, barbiturates, primidone, carbamazapine, oxcarbazepine, topiramate, felbamate, rifampicin, nelfinavir, ritonavir, griseofulvin, oral ketoconazole, on discretion of the Investigator
• Consumption of substances known to be potent inhibitors or inducers of cytochrome -P450 enzymes (CYP P450s) such as grapefruit juice, grapefruit juice containing products, and herbal remedies or dietary supplements containing St. John's Wort, in the 2 weeks before dosing
• Unlikely to comply with the protocol requirements, instructions and trial-related restrictions, for example, uncooperative attitude, inability to return for follow-up visits, and improbability of completing the trial
• Non-acceptance of study breakfast (for example, vegetarians, vegans and subjects who follow special diets)
• Excessive consumption of beverages -containing xanthine (> 5 cups ) of coffee a day, or equivalent or inability to stop consuming caffeine from 48 hours prior to drug administration until discharge from the clinic
• Subject is the Investigator or any Sub-Investigator, research assistant, pharmacist, trial coordinator, other staff or relative thereof directly involved in the conduct of the trial
• Vulnerable subjects (for example, persons kept in detention)
• Legal incapacity or limited legal capacity