| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Treatment of opioid dependence 
 |  
| Behandlung von Opioidabhängigkeit |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Treatment of opioid dependence |  
| Behandlung von Opioidabhängigkeit |  | 
| E.1.1.2 | Therapeutic area | Psychiatry and Psychology [F] - Behaviours [F01] | 
| MedDRA Classification | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| To evaluate the appropriate ratio of morphine  and naloxone to suppress the pleasurable effects of intravenous morphine and precipitate withdrawal reactions. |  | 
| E.2.2 | Secondary objectives of the trial | 
| Assessment of individual physiological variables and symptoms and vital signs during study drug administration at various time points. Assessment of safety including adverse events, clinical laboratory results and vital signs.
 
 
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| - Male, over the age of 18 years - meet DSM-IV criteria for the diagnosis of opioid dependence currently undergoing morphine mainteinance treatment,
 - with a history of regular opioid abuse,
 - under opioid maintenance treatment for opioid abuse with morphine (occasionally injecting heroin) with a constant dose for ≥ 1 month,
 - in good health and have venous access sufficient for i.v. drug administration
 - with assessed normal QTc time (Bazzett corrected <500ms),
 - negative urine test (except for THC- tetrahydrocannabinol, “marijuana” and opioids)
 - agree to be admitted to the inpatient research unit  for a minimum of 7 days, and be able to complete all protocol-specified assessments,
 - signed written informed consent.
 |  
| Einschlusskriterien: - Männlich, über 18 Jahre.
 - Opioidabhängigkeit entsprechend DSM-IV, unter  aktueller Substitutionstherapie mit Morphin.
 bekannter, regelmäßiger Opioid Mißbrauch.
 - Substitutionstherapie für Drogenabhängige mit Morphin (gelegentlicher Heroinkonsum), konstante Dosierung für ≥ 1 Monat.
 - im guten Gesundheitszustand und ausreichenden venösen Zugang für i.v. Verabreichungen.
 - normale QTc Zeit.
 - neg. Drogenharntest (Ausnahme: THC , Marijuana und Opioide).
 - Patienteneinwilligung 7 Tage stationär aufgenommen zu werden und  sich allen protokollspezifischen Untersuchungen zu unterziehen.
 - Unterzeichnete Einwilligungserklärung.
 
 
 |  | 
| E.4 | Principal exclusion criteria | 
| - with clinically significant somatic illnesses (except stable chronic hepatitis), - with acute psychotic illnesses, i.e. known schizophrenia, major depression with suicidal intent,
 - with opioid maintenance treatment with morphine at variable doses or for a period of < 1 month,
 - with daily alcohol consumption of > 100 g during the last 4 weeks,
 - with cocaine dependence,
 - showing contraindications to morphine (known hypersensitivity to opioids, restricted respiratory function, serious impairment of liver and/or kidney function, inter alia),
 - uncooperative patients, unwilling to follow instructions by the Investigator,
 - patients scheduled for any major surgery or intervention, which would fall within the study period,
 - patients who have participated in another clinical research study involving a new chemical entity within 3 months of study entry,
 - patients who, in the opinion of the Investigator, are unsuitable to participate in the study for any other reason not mentioned in the inclusion and exclusion criteria,
 - with imprisonment or under criminal prosecution for the following
 4 week-period,
 - with incapacitation and court appointment.
 - with documented (ultrasound or right heart catheter) heart failure (NYHA >II)
 - with documented (ECG) history of cardiac arrhythmia
 |  
| Ausschlusskriterien: - klinisch signifikante somatische Erkrankung  (Ausnahme: stabile chronische Hepatitis).
 - akute psychotischer Erkrankung (z. B Schizophrenie, ..).
 - unter Substitutionstherapie für Drogenabhängige mit Morphin , variabler Dosierung für < 1 Monat.
 - mit einem täglichen Alkoholkonsum von > 100g während der letzten 4 Wochen.
 - Kokainabhängigkeit.
 - Kontraindikationen gegenüber Morphin (Hypersensitivität, eingeschränkte respiratorische Funktion, …).
 - Mangelnde Kooperationsbereitschaft mit dem Studienteam
 - Patienten mit einem geplanten größeren Eingriff bzw. Intervention während der Studiendauer
 - Behandlung mit einer nicht zugelassenen Medikation innerhalb von 3 Monaten vor Studienbeginn
 - Patienten, die aus der Sicht des Prüfers aufgrund von weiteren Gründen (welche nicht in den Aus- und Einschlusskriterien enthalten sind) nicht an dieser Studie teilnehmen sollten
 - Freiheitsstrafe oder Strafverfolgung für die nächsten 4 Wochen
 - Entmündigung oder Strafverfahren
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Signs and symptoms of opioid-withdrawal at various time points. |  
| Messung der Entzugssymtomatik |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| 0 to 120 minutes |  
| 0 bis 120 Minuten |  | 
| E.5.2 | Secondary end point(s) | 
| - Pupil diameter and vital signs at various time points. 
 |  
| Pupillendurchmesser und Vitalparameter zu verschiedenen Zeitpunkten. |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| 0 to 120 minutes |  
| 0 bis 120 Minuten |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| E.6.3 | Therapy | Yes | 
| E.6.4 | Safety | Yes | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | No | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | No | 
| E.6.11 | Pharmacogenomic | No | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | No | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | Yes | 
| E.7.3 | Therapeutic confirmatory (Phase III) | No | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | Yes | 
| E.8.1.1 | Randomised | Yes | 
| E.8.1.2 | Open | No | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | Yes | 
| E.8.1.5 | Parallel group | No | 
| E.8.1.6 | Cross over | Yes | 
| E.8.1.7 | Other | No | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | Yes | 
| E.8.2.2 | Placebo | No | 
| E.8.2.3 | Other | Yes | 
| E.8.2.3.1 | Comparator description |  | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | The trial involves single site in the Member State concerned | Yes | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | No | 
| E.8.5 | The trial involves multiple Member States | No | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.7 | Trial has a data monitoring committee | No | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 3 | 
| E.8.9.1 | In the Member State concerned months |  | 
| E.8.9.1 | In the Member State concerned days |  |