Study to Assess Safety, Tolerability, and Interactions of Cocaine and Oral AFQ056

This is a study to assess safety, tolerability and interactions of AFQ056 and cocaine in patients with cocaine use disorder.

This is a randomized, participant- and investigator-blinded, placebo-controlled, parallel group study to assess safety and tolerability and to compare the effects of AFQ056 on IV cocaine's physiological and subjective effects in non-treatment seeking, cocaine-experienced participants who meet American Psychiatric Association Diagnostic and Statistical Manual (DSM-V) criteria for cocaine use disorder.

Approximately twenty participants will be randomized to 2 groups (10 in each group), receiving either AFQ056 or placebo treatment for 8 days.

Participants will be screened for eligibility as outpatients and inpatients. Outpatient screening will occur between Day -28 and Day -4. On Study Day -3, participants will undergo clinic intake to screen for continued eligibility. On Study Day -2, participants will be screened for eligibility with a participant-blinded screening infusion (Infusion Session 1) of 20 mg cocaine, followed by a saline infusion, followed by a 40 mg cocaine infusion. Each 2 ml infusion of cocaine and saline will be administered by IV over a 60 second time period and approximately 60 minutes apart. Physiological and subjective data (VAS) from these sessions will be part of the eligibility criteria to continue in the study.

Once a participant has been determined to be eligible, the participant will be randomized on Day -1 to receive either AFQ056 or placebo in a 1:1: ratio and at the same time, will also be randomized to a specific couple of sequences saline/cocaine or cocaine/saline for Infusion Session 2 and Infusion Session 3 within each treatment group. The order of the saline and cocaine infusions for each participant for Infusion Sessions 4 and 5 will be the same as the randomized order for Infusion Sessions 2 and 3, respectively.

Participants will receive baseline infusions determined by the randomized sequences of saline and 20 mg of cocaine on Day 1 (Infusion Session 2) and saline and 40 mg of cocaine on Day 2 (Infusion Session 3). The participants will receive either AFQ056 or matching placebo twice a day from Days 3 to 9. The AFQ056 treatment group will be up titrated to 200 mg according to the following dosing schedule: Day 3: 50 mg twice daily; Day 4: 100 mg twice daily and Days 5-9: 200 mg twice daily. On Day 10, participants will be administered only the morning dose of AFQ056 200 mg or placebo. AFQ056 doses must be taken within 30 minutes of meals. On Day 9 and Day 10, approximately 4 hours after the morning dose of AFQ056 200 mg or placebo, participants will receive treatment infusions determined by the randomized sequence of saline and 20 mg of cocaine on Day 9 (Infusion Session 4) and saline and 40 mg of cocaine on Day 10 (Infusion Session 5). The participants will be discharged from the research clinic on Day 12, two days after the last infusion of cocaine (Infusion Session 5) and will have a Follow-up visit between 7 and 14 days after clinic discharge. A safety follow-up call will be conducted 30 days following the last administration of study treatment on Day 40.

Eligibility Criteria:
Key Inclusion Criteria:

* Non-treatment seeking participants who meet DSM-V criteria for cocaine use disorder as assessed using the Mini International Neuropsychiatric Interview (MINI) neuropsychiatric interview (version 7.0).
* Be between 18 and 55 years of age, inclusive
* Have a body mass index (BMI) within a range of 18.0 to 34.0 kg/m2 and a minimum weight of at least 50.0 kg at screening.
* Have experience using cocaine by the smoked or IV route at least 6 times in the past 12 months prior to clinic intake (Day -3) and at least one use within the past 30 days.
* Provide a urine sample positive for cocaine at least once during screening (Days -28 to -4).

Key Exclusion Criteria:

* Have a current or past history of seizure disorder, including alcohol- or stimulant-related seizure, febrile seizure, or significant family history of idiopathic seizure disorder.
* Have any previous medically adverse reaction to cocaine, including loss of consciousness, chest pain, paranoid reaction or seizure.
* Have clinically significant findings in the opinion of an investigator based on the MINI (version 7.0) neuropsychiatric interview.
* Be pregnant or lactating.
* Women of child-bearing potential, defined as all women physiologically capable of becoming pregnant, unless they are using highly effective methods of contraception from at least 30 days prior to the first administration of study treatment (Day -2), while taking study treatment, and for at least 30 days after the last dose of the study treatment.
* Have a systolic blood pressure \> 140 mmHg, diastolic blood pressure \> 90 mmHg and heart rate \> 100 beats per minute at screening or clinic intake (Day -3).
* Have a history of liver or renal disease or current elevation of aspartate aminotransferase (AST), alanine aminotransferase (ALT) or creatinine, 1.5 × the upper limit of normal at screening or intake (Day -3).