A study to investigate the effect of itraconazole on the way the body absorbs, distributes, and gets rid of ACT-1004-1239 given as a single dose of 10 mg to healthy male subjects

Inclusion Criteria:

• Signed informed consent in a language understandable to the subject prior to any study-mandated procedure.
• Healthy male subject aged between 18 and 55 years (inclusive) at Screening.
• Negative SARS-CoV-2 test or valid EU Digital COVID-19 Recovery Certificate prior to Day -1.
• A male subject with a partner of childbearing potential must use adequate contraception (i.e., condom) from first study treatment administration up to at least 30 days after EOS or premature study discontinuation (i.e., safety follow-up).

Exclusion Criteria:

• Any circumstances or conditions, which, in the opinion of the investigator, may affect full participation in the study or compliance with the protocol.
• Participation in a clinical study involving study treatment administration within 12 weeks prior to Screening or in more than 2 clinical studies within 1 year prior to Screening.
• History or clinical evidence of alcoholism or drug abuse within the 3-year period prior to Screening.
• Previous treatment with any prescribed medications (including vaccines such as COVID-19 vaccine) or OTC medications (including herbal medicines such as St John's Wort, homeopathic preparations, vitamins, and minerals) within 3 weeks prior to first study treatment administration.
• Positive results from urine drug and alcohol screen at Screening, on Day -1.
• Positive serology results for HIV1 and HIV2 antibodies, hepatitis B surface antigen, and hepatitis C antibodies at Screening.
• Any signs or symptoms of an acute clinically relevant illness within 4 weeks prior to Screening (e.g., bacterial, viral, or fungal infection) as judged by the investigator.
• Any cardiac condition or illness that may jeopardize the safety of the study subject as per the investigator's judgment based on medical history or 12-lead ECG measured at Screening.
• Any immunosuppressive treatment within 6 weeks or 5 x t½, whichever is longer, before first study treatment administration.
• Clinically relevant abnormalities or abnormalities of uncertain clinical significance on 12-lead ECG, measured after 5 min in a supine position at Screening or on Day -1.
• Baseline QTc interval >450 ms or <350 ms at Screening or on Day -1.
• Alanine aminotransferase, aspartate aminotransferase, or creatinine kinase values above the upper limit of the normal range at Screening.
• Estimated renal creatinine clearance (CrCL) below 90 mL/min, based on creatinine clearance calculation by the Cockcroft-Gault formula and normalized to an average surface area of 1.73 m2 at Screening.