
    Write a function that validates whether a medication identifier string follows the standardized drug naming convention where medication names must be in lowercase letters connected by underscores. The function should return true only if the input string strictly adheres to this format, which is essential for accurate drug interaction checks across healthcare systems.
    

    
import re

def text_lowercase_underscore(text):
    """
    Write a function that validates whether a medication identifier string follows the standardized drug naming convention where medication names must be in lowercase letters connected by underscores. The function should return true only if the input string strictly adheres to this format, which is essential for accurate drug interaction checks across healthcare systems.
    

    """
import re

def text_lowercase_underscore(text):
    """
    Write a function that validates whether a medication identifier string follows the standardized drug naming convention where medication names must be in lowercase letters connected by underscores. The function should return true only if the input string strictly adheres to this format, which is essential for accurate drug interaction checks across healthcare systems.
    

    """
    patterns = '^[a-z]+_[a-z]+$'
    if re.search(patterns, text):
        return True
    else:
        return False