Efficacy of Pregabalin and Duloxetine in Patients With PDPN: the Effect of Pain on Cognitive Function, Sleep and Quality of Life
Efficacy of Pregabalin and Duloxetine in Patients With PDPN: the Effect of Pain on Cognitive Function, Sleep and Quality of Life
The objective and the purpose of the trial is to: assess the efficacy of Pregabalin Krka and
 Dulsevia® in patients with PDPN, investigate the effect of Pregabalin Krka and Dulsevia® on
 pain and on quality of life (QOL), depression symptoms, cognitive functions, sleep quality
 and daytime sleepiness and assess the safety of Pregabalin Krka and Dulsevia® in patients
 with PDPN.

 During the 3 months (12 weeks) 5 visits and 2 phone calls are planned.

 After the ICF signature and before therapy is allocated, a screening procedure is carried out
 to verify eligibility: laboratory analyses (concentrations of TSH, vitamin B12, folic acid,
 glucose, HbA1c, pregnancy test for women of childbearing potential), assessment of PDPN (with
 questionnaire DN4), assessment of cognition (with questionnaire MoCA), habits, medical
 history (medical/surgical history and concomitant diseases, previous and/or existing therapy
 of pain in PDPN, concomitant medications) with measurements and evaluation of pain according
 to VAS.

 On Visit 2 investigator checks the results of laboratory tests, of pregnancy test, measures
 vital signs, evaluates pain in PDPN according to VAS, checks previous analgesic therapy and
 concomitant medications.

 If patient meets all inclusion and exclusion criteria, he/she is eligible and will be
 randomly assigned (automatically through electronic version of case report form (eCRF) into
 two therapy groups (treatment arms) - tretament with Pregabalin Krka OR treatment with
 Dulsevia®.

 Investigator performs assessments of: QoL, sleep quality and daytime sleepiness, depression
 and adverse events.

 At Visit 3, compliance monitoring is done, pain intensity in PDPN by VAS is evaluated,
 concomitant therapy is checked, vital signs are measured, doses of IMP are adjusted and
 adverse events assessment are carried out.

 At Visit 4, pregnancy test for women of childbearing potential and compliance monitoring are
 carried out; concomitant medications are checked, vital signs are measured, pain intensity in
 PDPN by VAS is evaluated, IMP are adjusted and assessment of adverse events is carried out.

 At Visit 5 investigator performs again assessments of: QoL, sleep quality and daytime
 sleepiness, depression, cognition and PDPN. Evaluation of the pain intensity in PDPN by VAS
 and assessment of the adverse events should be performed. Pregnancy test for women of
 childbearing potential is carried out.
During the 3 months (12 weeks) 5 visits and 2 phone calls are planned.

 Procedures and administration:

 On arrival at the trial site at Visit 1 the patient receives the complete information on the
 trial procedures. The patient confirms his decision to participate by signing the informed
 consent form (ICF). After the ICF signature and before therapy is allocated, a screening
 procedure is carried out to verify eligibility: laboratory analyses (concentrations of TSH,
 vitamin B12, folic acid, glucose, HbA1c, pregnancy test for women of childbearing potential),
 assessment of PDPN (with questionnaire DN4), assessment of cognition (with questionnaire
 MoCA), habits, medical history (medical/surgical history and concomitant diseases, previous
 and/or existing therapy of pain in PDPN, concomitant medications) with measurements and
 evaluation of pain according to VAS.

 Patient is instructed not to take any PDPN medication and/or analgesics, if existing on a day
 of Visit 2.

 Information obtained at Visit 1 is input in the eCRF.

 Visit 2 (initial baseline visit): 0-7 days after Visit 1

 Investigator checks the results of laboratory tests, of pregnancy test, measures vital signs
 (heart rate, blood pressure), evaluates pain in PDPN according to VAS (separate assessments
 of current pain intensity, average pain intensity in last 24-h, worst pain intensity in last
 24-h, average pain intensity in last 4 weeks and worst pain intensity in last 4 weeks),
 checks previous analgesic therapy and concomitant medications.

 If patient meets all inclusion and exclusion criteria, he/she is eligible and will be
 randomly assigned (automatically through electronic version of case report form (eCRF) into
 two therapy groups (treatment arms).

 Investigator performs assessments of: QoL (with questionnaire SF-36), sleep quality and
 daytime sleepiness (with questionnaires ISI and ESS), depression (with questionnaire MDI) and
 adverse events.

 Administration:

 Eligible screened patients are randomly assigned into two therapy groups (treatment arms):

 ARM 1: treatment with pregabalin (Pregabalin Krka) or ARM 2: treatment with duloxetine
 (Dulsevia®).

 Each patient receives a Patient diary number 1, including the doses of Pregabalin Krka or
 Dulsevia® (depending on randomization) from Visit 2 (day 1) till Phone call 1, scales for
 assessing the pain and with the date of Phone call 1.

 Treatment during PERIOD 1 (FLEXIBLE-DOSE REGIMEN during the first 14 days (±3 days) in order
 to allow the investigator to give each patient an optimal dose of IMP.

 -  ARM 1: pregabalin (Pregabalin Krka 25-150 mg/ day) FLEXIBLE-DOSE REGIMEN. Investigator
 can choose total Pregabalin Krka daily dose: 25 mg/day, 50 mg/day, 75 mg/day, 150 mg/day
 or 300 mg/day (from Phone call 1 further on)

 -  ARM 2: duloxetine (Dulsevia® 30-60 mg/ day) FLEXIBLE-DOSE REGIMEN:

 Investigator can choose total Dulsevia® daily dose: 30 mg/day or 60 mg/day

 At the Visit 2, RM is given to each patient to cover the treatment till the next Visit 3.

 Phone call 1: week 1 (± 3 days) At week 1 (7 ± 3 days after Visit 2) investigator calls the
 patient by phone and ask him or her about possible adverse events and to evaluate the pain
 intensity in PDPN by VAS which is a part of Patient diary 1.

 Investigator can adjust the dose of IMP during phone call:

 -  If average pain intensity in PDPN in last 24-h equal or below 30 mm (measured by VAS) is
 NOT achieved, the investigator can increase the dose;

 -  if bothersome adverse event occurs the investigator can decrease the dose (if possible).

 The investigator also ask the patient if he or she is taking the IMP appropriately (according
 to investigator's instructions).

 NOTE: On the next visit (Visit 3; 14 ± 3 days after Visit 2) following daily doses should be
 achieved by each patient:

 -  ARM 1: Total Pregabalin Krka daily dose: MINIMUM dose 150 mg/day

 -  ARM 2: Total Dulsevia daily dose: MINIMUM dose 60 mg/day

 Visit 3: week 2 (14 ± 3 days after Visit 2) At Visit 3, compliance monitoring is done, pain
 intensity in PDPN by VAS is evaluated, concomitant therapy is checked, vital signs are
 measured, doses of IMP are adjusted and adverse events assessment are carried out.

 Investigator collects the Patient Diary 1. Data in Patient Diary 1 are checked.Treatment
 during PERIOD 2 (it lasts 6 weeks)

 Treatment options:

 ARM 1: pregabalin (Pregabalin Krka) Investigator can choose: total Pregabalin Krka daily
 dose: 150 mg/day or 300 mg/day or 600 mg/day

 NOTE:

 If in the opinion of the investigator the minimum IMP dose of 150 mg of Pregabalin Krka/ 60
 mg of Dulsevia® can not be reached after Visit 3, the patient must be excluded from the
 trial.

 ARM 2: duloxetine (Dulsevia®)

 Investigator can choose:

 -  total Dulsevia® daily dose*: 60 mg/day or 90 mg/day* or total Dulsevia® daily dose**:
 120 mg/day

 -  once daily dosing by using available dosages. **the daily dose will be achieved
 with two devided doses of Dulsevia® by using available dosages.

 ARM 1: pregabalin (Pregabalin Krka)

 -  If average pain intensity in PDPN in last 24-h equal or below 30 mm (measured by VAS) or
 reduction of pain equal or more than 30 % compared with baseline is achieved during
 period 1, further treatment with Pregabalin Krka 150 mg/day or 300 mg/day in the period
 2 is required.

 -  If average pain intensity in PDPN in last 24-h equal or below 30 mm (measured by VAS) or
 reduction of pain equal or more than 30 % compared with baseline is NOT achieved,
 further treatment with a dose of:

 -  150 mg/day (if patient was till now treated with equal dose) or 300 mg/day (if
 patient was till now treated with equal dose to 150 mg or 300 mg) or 600 mg/day (if
 patient was till now treated with equal dose to 300 mg) is required.

 ARM 2: duloxetine (Dulsevia®)

 -  If average pain intensity in PDPN in last 24-h equal or below 30 mm (measured by VAS) or
 reduction of pain equal or more than 30 % compared with baseline is achieved further
 treatment with Dulsevia® 60 mg/day in the period 2 is required.

 -  If average pain intensity in PDPN in last 24-h equal or below 30 mm (measured by VAS) or
 reduction of pain equal or more than 30 % compared with baseline is NOT achieved,
 further treatment with the dose of:

 -  Dulsevia® 60 mg/day (if patient was till now treated with equal dose) or Dulsevia®
 90 mg/day (if patient was till now treated with lower dose) or Dulsevia® 120 mg/day
 (if patient was till now treted with lower dose) is required.

 At the Visit 3, RM is given to each patient to cover the treatment till the next Visit 4.
 Patient is requested to bring packages with all blisters (empty blisters and blister with
 unused IMPs and RM) on the Visit 4.

 Each patient receives a Patient diary number 2, including the doses of Pregabalin Krka or
 Dulsevia® (depending on randomization) from Visit 3 till Phone call 2, scales for assessing
 the pain and with the date of Phone call 2 (28 ± 3 days after Visit 3).

 Patient is requested to bring the Patient diary on the next visit.

 Information obtained at Visit 3 is input in the eCRF.

 Phone call 2: 4 weeks(28 ± 3 days) after visit 3 At week 6 (28 ± 3 days after Visit 3) the
 investigator again calls the patient by phone and asks him or her about possible bothersome
 adverse events and to evaluate the pain intensity in PDPN by VAS (separate assessments of
 current pain intensity, average pain intensity in last 24-h and worst pain intensity in last
 24-h) which is a part of Patient diary 2.

 The investigator can adjust the dose of Pregabalin Krka or Dulsevia®, if necessary. If
 average pain intensity in PDPN in last 24-h equal or below 30 mm (measured by VAS) is NOT
 achieved the investigator can increase the dose and if bothersome adverse event occurs the
 investigator can decrease the dose to the previous dose.

 The investigator also checks if the patient takes the medicines appropriately (according to
 investigator's instructions).

 Visit 4: week 8 (42 ± 3 days after Visit 3) At Visit 4, pregnancy test for women of
 childbearing potential and compliance monitoring are carried out; concomitant medications are
 checked, vital signs are measured, pain intensity in PDPN by VAS is evaluated (separate
 assessments of current pain intensity, average pain intensity in last 24-h and worst pain
 intensity in last 24-h, average pain intensity in last 4 weeks and worst pain intensity in
 last 4 weeks), IMP are adjusted and assessment of adverse events is carried out. Investigator
 collects the Patient Diary 2. Data in Patient Diary 2 are checked.

 Treatment options during PERIOD 3 (it lasts 4 weeks) ARM 1: pregabalin (Pregabalin Krka)

 Investigator can choose:

 Total Pregabalin Krka daily dose: 75 mg/day *,150 mg/day, 300 mg/day or 600 mg/day

 *only in case of bothersome adverse events

 ARM 2: duloxetine (Dulsevia®) Investigator can choose:Total Dulsevia® daily dose: 30 mg/day*,
 60 mg/day, 90 mg/day or 120 mg/day *only in case of bothersome adverse events

 Arm 1: pregabalin (Pregabalin Krka)

 • If average pain intensity in PDPN in last 24-h equal or below 30 mm (measured by VAS) or
 reduction of pain equal or more than 30 % compared with Visit 3 is achieved, further
 treatment with previous dose in the period 3 is required.

 • If average pain intensity in PDPN in last 24-h equal or below 30 mm (measured by VAS) or
 reduction of pain equal or more than 30 % compared with Visit 3 is NOT achieved on daily dose
 150 mg, further treatment with a dose of: 150 mg/day (if patient was till now treated with
 equal dose) or 300 mg/day (if patient was till now treated with lower or equal dose) or 600
 mg/day (if patient was till now treted with lower or equal dose) is required.

 Arm 2: duloxetine (Dulsevia®)

 -  If average pain intensity in PDPN in last 24-h equal or below 30 mm (measured by VAS) or
 reduction of pain equal or more than 30 % compared with Visit 3 is achieved further
 treatment with previous dose in the period 3 is required.

 -  If average pain intensity in PDPN in last 24-h equal or below 30 mm (measured by VAS) or
 reduction of pain equal or more than 30 % compared with Visit 3 is NOT achieved, further
 treatment with a dose of:

 Dulsevia® 60 mg/day (if patient was till now treated with equal dose) or Dulsevia® 90 mg/day
 (if patient was till now treated with lower or equal dose) or Dulsevia® 120 mg/day (if
 patient was till now treated with lower or equal dose).

 At the Visit 4, RM is given to each patient to cover the treatment till the next Visit 5.

 Visit 5: week 12 (28 ± 3 days after Visit 4) At Visit 5 investigator performs again
 assessments of: QoL, sleep quality and daytime sleepiness, depression, cognition and PDPN.

 Evaluation of the pain intensity in PDPN by VAS and assessment of the adverse events should
 be performed.

 Pregnancy test for women of childbearing potential is carried out.

 Compliance monitoring, measurement of vital signs and concomitant medications are also
 carryed out by investigator.
Inclusion Criteria:

 1. Female and male patients aged 18-85 years.

 2. Patients with a history of type 2 diabetes mellitus according to The American Diabetes
 Association (ADA).

 3. Patients with a diagnosis of painful diabetic peripheral neuropathy (PDPN) caused by
 type 2 diabetes mellitus based on DN4 ≥4.

 4. Patients whose average pain intensity in PDPN in last 24 hours (measured by VAS),
 evaluated on baseline visit, is equal or more than 40 mm (0 mm ='no pain' and 100 mm
 ='worst possible pain').

 5. Ability to adhere to trial protocol.

 6. Written informed consent.

 The methods for inclusion criteria assessment include medical history, interview,
 completing the DN4 questionnaire, physical examination, assesment of pain on VAS and
 laboratory analyses.

 Exclusion Criteria:

 1. Patients who took PDPN medication and/or analgesics on a day of baseline visit.

 2. Patients with a known hypersensitivity to duloxetine, pregabalin, paracetamol or
 tramadol or any of the inactive ingredients or have any contraindication for the use
 of duloxetine, pregabalin, paracetamol or tramadol.

 3. Patients with a history of inadequate pain response (pain reduced was equal or less
 than 30%) to:

 3.1. pregabalin at maximum allowed treatment daily dose 600 mg, 3.2. duloxetine at
 maximum allowed treatment daily dose 120 mg, 3.3. venlafaxine at maximum allowed
 treatment daily dose 375 mg, 3.4. gabapentin on daily treatment dose more than 1800 mg
 3.5. amitriptilin at maximum allowed treatment daily dose 150 mg.

 4. Patients, who are currently treated with a daily dose that exceeds:

 4.1. 150 mg of pregabalin, 4.2. 60 mg of duloxetine, 4.3. 150 mg of venlafaxine, 4.4.
 600 mg of gabapentin.

 5. Patients with an uncontrolled type 2 diabetes mellitus.

 6. The average scores of less than 20 on MoCA.

 7. Have any other type of neuropatic pain, contrasted to PDPN.

 8. Evidence of another cause of distal polyneuropathy other than diabetic.

 9. Have a serious (evaluated by physician) unstable cardiovascular (e.g. uncontrolled
 hypertension), hepatic, renal, respiratory, ophthalmologic, gastrointestinal, or
 hematologic illness, symptomatic peripheral vascular disease, malignant disease or
 other medical condition that could lead to hospitalisation during the course of the
 trial.

 10. Have a diagnosis or history of uncontrolled glaucoma.

 11. Known or suspected alcohol or drug abuse or addiction (excluding nicotine and
 caffeine).

 12. Patients with a history of depression (less than one year after completing the last
 medical treatment), mania, bipolar disorder, psychosis or schizophrenia.

 13. Pregnancy, lactation and women of child-bearing potential without highly effective* or
 at least acceptable** contraception (according to the Recommendations related to
 contraception and pregnancy testing in clinical trials).

 14. Patients with a history of epilepsy, stroke or neurodegenerative disease.

 15. Patients taking Monoamine oxidase (MAO) inhibitors or are within one year of their
 withdrawal.

 16. Acute liver injury (such as hepatitis) or severe cirrhosis (Child-Pugh Class C).

 17. Patients with suspected Restless leg syndrome (RLS).

 18. Abnormal thyroid-stimulating hormone (TSH) concentrations (according to the references
 value of the local laboratory).

 19. Vitamin B12 and folic acid deficiency (according to the reference values of the local
 laboratory).

 20. Surgical procedures planned to occur during trial (patients may be rescreened
 following completion of and recovery from the surgical procedure).

 21. Concomitant treatment that might influence the final therapeutic effect of the tested
 active substances including non-medical treatments.

 22. Patients who under the opinion of the investigator will not be compliant to the
 treatment or not be able to finish the trial for any other reason.

 -  Highly effective contraception is:

 -  combined (estrogen and progestogen containing) hormonal contraception
 associated with inhibition of ovulation(oral, intravaginal, transdermal)

 -  progestogen-only hormonal contraception associated with inhibition of
 ovulation (oral, injectable, implantable)

 -  intrauterine device (IUD)

 -  intrauterine hormone-releasing system (IUS)

 -  bilateral tubal occlusion

 -  vasectomised partner

 -  sexual abstinence

 **Acceptable contraception is:

 -  progestogen-only oral hormonal contraception, where inhibition of ovulation
 is not the primary mode of action

 -  male or female condom with or without spermicide

 -  cap, diaphragm or sponge with spermicide