Inclusion Criteria:  Male and female patients (18 years and older) Chronic (for at least three months) non-specific pain in the lower back (between the lower ribcage and the gluteal folds) Pain intensity on average at least 4 points on an 11-point NRS (one month before the start of the study) Patients with indicated drug treatment where previous optimised treatments with non-opioid analgesics have not led to sufficient pain relief or were unsuitable due to contraindications or intolerance. Willingness of both men and women to use a reliable method of contraception during study participation and for three months after taking the last dose of the IMP Signed patient information and informed consent form is available Understanding of the German language, ability to give consent and compliance The patient has understood the instructions to avoid changes in lifestyle and dietary habits The patient has understood the principle of the patient diary and gives their consent to keep it as instructed  Additional for Phase A  a1. Pain intensity averaged at least 4 points on an 11-point NRS (there must be at least 5 pain intensity readings in the morning from the run-in phase)  a2. Willingness not to take any analgesic medication (non-opioid and opioid analgesics as well as adjuvant analgesics) during participation in study Phase A (except rescue medication)  a3. Willingness to continue a current non-drug therapy unchanged as planned during participation in Phase A  Additional for Phase B  b1. Previous and complete participation in Phase A until and including Visit A6  b2. Patient wishes to participate voluntarily in the long-term study  b3. From the investigator's point of view, further participation is considered medically safe  b4. Willingness not to take any additional analgesic medication (non-opioid and opioid analgesics as well as adjuvant analgesics) during the last three weeks of study Phase B (except rescue medication).  Additional for Phase C  c1. Previous and complete participation in Phase B until and including Visit B10  c2. Patient wishes to participate voluntarily in the long-term study  c3. From the investigator's point of view, further participation is considered medically safe  Additional for Phase D  d1. Previous and complete participation in Phase B until and including Visit B10 (patients received Ver-01 for 26 weeks)  d2. Patient has experienced a pain score improvement of at least 30% in treatment Phase B (mean value of the study week 43 compared to the mean value of the run-in phase, there must be at least four values from study week 43 and five values from the run-in phase)  d3. Patient wishes to participate voluntarily in the study  d4. From the investigator's point of view, further participation is considered medically safe  d5. Willingness not to take any analgesic medication (non-opioid and opioid analgesics as well as adjuvant analgesics) during participation in study Phase D (except rescue medication)  d6. Willingness to continue a current non-drug therapy unchanged as planned during study  Exclusion Criteria:  Professional groups for which the ability to operate machinery and drive vehicles is the primary activity (including truck, bus and forklift drivers, pilots) Alcohol/drug/medication abuse and previous or current intake of methadone in the patient's medical history or suspected by the investigator Intake of analgesic medication (non-opioid and opioid analgesics as well as adjuvant analgesics) within seven days prior to the start of the study Taking cannabis-based products within 30 days prior to the start of the study HIV, dementia (which impairs the assessment of symptoms) Severe forms of the following diseases: Anaemia,hematological/autoimmune/endocrinal/ renal/hepatic/respiratory/cardiovascular or gastrointestinal diseases, symptomatic peripheral vascular diseases Cardiovascular event in the past three months, poorly managed high blood pressure, untreated hypothyroidism, patients with Crigler-Najjar syndrome or Rotor syndrome, surgery within the past two months Severe mental illnesses (e.g. psychosis, schizophrenia, bipolar disorder), severe depression that is not due to the chronic non-specific low back pain, or individuals at risk of suicide (examined using the MINI questionnaire) Severe mental illness (psychosis, schizophrenia, bipolar disorder, severe depression, anxiety disorder) in a first-degree relative (parents and children); suicide in a first-degree relative (parents and children) Patients with an active cancer or tumor-related pain or severe pain due to physical injury Other painful comorbidities, excluding low back pain, that could interfere with the patient's evaluation during the study or the assessment of pain Well-known strong adverse events in connection with cannabis consumption before the start of the study Known allergy to cannabis and/or sesame seeds and products derived from them Known hypersensitivity to the ingredients of the rescue medication Planned blood donation, planned sperm or egg donation, planned freezing of eggs or sperm Pregnancy, breastfeeding, desire to have children (within the next 20 months) Participation in another clinical trial within the past 30 days before the start of the study Inability to give consent, care dependency, patient has a legal guardian/caregiver, or is immobile The patient is in need of special protection (e.g., incarcerated; institutionalized by a court or judicial authority; in a dependent or employment relationship with the sponsor, an external service provider of the sponsor (who is involved in the study conduct), the investigator, or the study site).  Additional for Phase A:  a1. In the case of a current non-drug therapy (e.g. physical or behavioural therapy, acupuncture,massage, thermotherapy), which significantly modulates the perception of pain, it was not maintained unchanged for at least eight weeks prior to study participation in Phase A.  Additional for Phase D  d1. Intake of additional analgesic medication (non-opioid and opioid analgesics as well as adjuvant analgesics) within 21 days prior to the start of study Phase D (except rescue medication).  d2. In the case of a current non-drug therapy (e.g. physical or behavioural therapy, acupuncture,massage, thermotherapy) that significantly modulates the perception of pain, it was not maintained unchanged for at least nine weeks prior to the start of study Phase D.