Patients from the pharmacies assigned as treatment group will receive intervention. Intervention are education (aid with leaflet and video) and medication review with counselling.

Patients from the pharmacies assigned as control group will receive as usual care they have been provided regularly.

Education on osteoarthritis and pain management will be provided to the patients by face-to-face communication at the first meeting, aided with a leaflet, then patients will get the follow-up calls and a video will be shown to enforce the intervention. Medication review includes the assessment of patients' knowledge on the indication, identification of any drug-related problem, and counseling on the proper use of medication.

Numeric pain rating scale will be used to measure the pain intensity. The numeric pain rating scale (NPRS) is an 11-point scale. Respondents can choose a number between 0 to 10, where 0 = no pain and 10 = extreme or worst pain. It has shown a high correlation with the visual analogue scale and can be used in rheumatoid arthritis and other types of chronic pain. It can be administered verbally to be done over the telephone. It has been translated into the Nepalese language.

Patient knowledge will be assessed using the questionnaire developed by the principal investigator in consultation with literature review and expert consultation. It consists of 12 questions on osteoarthritis and pain management. It has been translated into Nepalese languages and validated. Correct responses will be counted and presented as percentages. Higher percentages mean better knowledge.

Western Ontario and Mc Master Universities Arthritis Index (WOMAC) is the tool commonly used for evaluation in osteoarthritis.It consist of 24 items divided into 3 subscales; pain (5 items), stiffness (2 items), physical Function (17 items). Its response is based on a number between 0 to 4, where 0=none, 1=mild, 2=moderate, 3=severe, 4=extreme.

Patient-Reported Outcomes Measurement Information System (PROMIS) depression scale 8 items: is a set of person-centred measures that evaluates mental health in adults and children. It can be used with the general population and individuals living with chronic conditions. Each item on the measure is rated on a 5-point scale (1=never; 2=rarely; 3=sometimes; 4=often; and 5=always) with a range in score from 8 to 40 with higher scores indicating greater severity of depression.