The purpose of this study is to test the safety of a novel gene viral vector treatment for adults with cocaine use disorder-sustained remission. This gene regulates an enzyme (cocaine hydrolase) that breaks down cocaine into inactive substances, thereby decreasing the pleasurable feeling this drug usually provides.

This is a phase-I dose escalation clinical trial testing the safety and MTD of IV administration of AAV8-hCocH to subjects with a history of cocaine use disorder-sustained remission. Subjects who provide written informed consent, meet entry criteria, and do not have transduction inhibition to AAV8 (pre-existing AAV8 antibodies) will be eligible. Subjects will be enrolled sequentially every 2-3 months or longer between cohorts. Dose escalation may be initiated after a single subject has been safely dosed; maximum enzyme expression is anticipated at week 3-4. This escalation paradigm is intended to minimize the number of subjects exposed to sub-therapeutic doses. The starting dose is based on the expression and safety of AAV8-CocH in mice, rats and NHP, and previous human experience using AAV8-FVIII IV in hemophilia patients. The starting dose has a large safety margin (15-fold) from the NOAEL in NHP. Approximately 7 weeks after an injection, a decision to escalate to the next dose level will be made based on a review of safety parameters and CocH levels by the investigative team.

Inclusion Criteria:

• Non-treatment seeking male or females ages 18 to 65 years, inclusive.
• DSM-5 diagnosis of cocaine use disorder in sustained remission as confirmed by the PI's review of the medical record.
• Are motivated to abstain from cocaine use during the period of the study, as evidenced both by the judgment of the Investigator or designee and by compliance with the requirement to make regular clinic visits.
• In the opinion of the PI, be in good general health as determined by medical and psychiatric history, general clinical examination, vital signs, and laboratory tests.
• Have provided written informed consent. Subjects should be cooperative, willing and able to participate and adhere to the protocol requirements.
• Have hematology, chemistry, kidney and liver function laboratory tests that are within (+/- 10%) of the current Mayo Clinic standardized normal values.
• Show a baseline EKG that demonstrates normal sinus rhythm and conduction without clinically significant abnormalities or arrhythmias.
• Are willing to return to research area for follow-up.

Exclusion Criteria:

• They show detectable pre-existing immunity to the AAV8 capsid as measured by AAV8 transduction inhibition and AAV8 total antibodies.
• Evidence of HIV or hepatitis of any etiology.
• Creatinine ≥ 1.5 mg/dL.
• Any disease or mental health condition at the physician's discretion that would prevent the subject from fully complying with the requirements of the study. The physician may exclude subjects with active alcohol abuse, other substance abuse or positive urine toxicology screen for substances of abuse.
• Pregnant &/or lactating. All lactating women will be excluded from study participation. Women of child-bearing potential must have a negative pregnancy test performed at screening visit, agree to use birth control throughout the study period, refrain from getting pregnant within the study period and consent to pregnancy testing throughout the study period. Men must agree to use barrier methods of birth control and refrain from fathering children within the next year.
• Morbid obesity (BMI > 40).