This is a post-market clinical follow-up study on an approved CE-marked eHealth system where a mobile phone application is used to measure the pupils and eye measurements to monitor the use of different drug substances. The goal of the study is to collect additional information when using the system and to improve the current models for indicating the use of cannabinoids and phenethylamines.

Drug intake of cannabinoid or phenethylamine will in this study be simulated using two commonly used medicines.

The study will include healthy volunteers where each participant will participate in the study for approximately 10 days. The participant will be using the mobile phone application for about a week, first at the clinic and then in the home environment. After approximately a week the participant will visit the clinic to be administered with the selected medicine whereafter the mobile phone application will be used for up to 5 hours. A final phone call will be taken place at approximately day 10, whereafter the participant has completed the study.

This is a controlled, prospective, post-market clinical follow-up study that aims to collect additional data on performance and safety of the CE-marked eHeatlh system Previct Drugs. Previct Drugs is intended to be used in treatment of substance use disorder (SUD) to support and monitor patients' treatment. The system relies on self-administered eye scanning performed with a mobile phone application where the analysis of the eye´s reaction on intake of drug substances gives an indication of different drug substances. The clinical data collected in this study is an important step to verify and improve the algorithms of Previct Drugs, and to improve the mathematical models for indicating the use of the substances cannabinoids and phenethylamines.

Drug intake will in this study be simulated by a controlled single application of commonly used medicines from cannabinoids and phenethylamine.

The study will enroll and follow 30 male and female healthy volunteers for participation of approximately 10 days. The study will consist of two visits to the clinic, and one follow-up telephone call before the participant has completed the study. Baseline data will be collected at the first visit on Day 0, including usage of Previct Drugs, followed by usage of Previct Drugs in the home environment for about one week. At visit 2 on Day 7, the subject will be administered with the medicine he/she has been randomized to and thereafter use Previct Drugs for up to 5 hours. A final follow-up telephone call will take place approximately at day 10 before the participant has completed the study.

Inclusion Criteria:

1. Male or female healthy volunteers.
2. Age 18 to 55 years.
3. BMI between 18.5-30 kg/m2.
4. Weight between 50-100 kg.
5. Healthy as determined by the investigator or designee based on pre-investigational medical and surgical history, and health examination at enrollment.
6. Women of childbearing potential (defined as all women who are not surgically sterile or postmenopausal for at least 1 year prior to enrollment) must have a negative urine pregnancy test at enrollment and at visit 2 and must agree to use a medically acceptable contraception from enrollment until clinical investigation completion.
7. No current drug usage defined as a negative urine drug test at enrollment and at visit 2.
8. Able to use Previct Drugs after initial training (defined as successfully performing a test set after trying maximum three times per measurement).
9. Voluntarily agrees to participate and has duly singed the Informed Consent Form.

Exclusion Criteria:

1. Participating in another clinical investigation which may affect the clinical investigation outcome according to clinical judgement.
2. Previously participated in the KCClin01 investigation.
3. Pregnant or lactating.
4. Blind and/or deaf.
5. Clinically abnormal ECG, according to the investigator. QTcF time above 450 ms at enrollment.
6. Resting heart rate above 90 BPM.
7. Current or recent history of alcohol misuse assessed by AUDIT where ≥6 points for women or ≥8 points for men indicates a potential misuse.
8. Current or history of psychiatric disorder or drug misuse assessed by M.I.N.I where the outcome will be based on clinical judgement.
9. Any disease or condition that may influence pupillary reflexes based on clinical judgement.
10. Undergone eye surgery that may influence pupillary reflexes based on clinical judgement.
11. Ongoing treatment with medications which may interfere with eye measurements based on clinical judgement.
12. Ongoing treatment with medications which may interfere with any of the medicinal products to be used.
13. History or presence of allergy or serious reaction to the medicinal products to be used.
14. History or presence of cardiovascular disease, e.g., arteriosclerosis, hypertension, or cor pulmonale.
15. History or presence of sleep-related breath disorder.
16. History or presence of gastrointestinal disease, e.g., paralytic ileus, acute abdomen, delayed gastric emptying, or chronic constipation.
17. History or presence of pulmonary disease, e.g., acute pulmonary insufficiency, severe respiratory depression with hypoxia, chronic obstructive lung disease, or bronchial asthma.
18. History or presence of autoimmune neuromuscular disease, e.g., myasthenia gravis.
19. Not able to read or understand the local language.
20. Any other condition that as judged by the investigator may make the follow-up or investigation inappropriate.