public IActionResult GetAllAvailableDrugs()
        {
            try
            {
                // checking if drug is available
                var drug = _drugService.GetAllAvailableDrugs();
                if (drug == null)
                {
                    return(NotFound("No Drug Available"));
                }
                return(Ok(drug));
            }

            catch (Exception e)
            {
                return(BadRequest("Error occured from " + nameof(DrugsApiController.GetAllAvailableDrugs) + " Error Message " + e.Message));
            }
        }