The song "Heavy Drug" by UNKLE is a metaphorical representation of a toxic and addictive relationship. The lyrics repeatedly emphasize the phrase "You're my heavy drug" to convey how the person being referred to acts as a powerful and intoxicating force in the narrator's life. The repetitive nature of the lyrics can symbolize the addictive nature of this relationship. Furthermore, the repeated line "I need your love" expresses the narrator's dependency on the individual, suggesting they crave their affection and attention despite the negative aspects of the relationship. The plea for love highlights the longing and desperation felt by the narrator. The song likely tells a story of someone trapped in a tumultuous relationship, where the highs and lows create a sense of dependency and addiction. The metaphorical use of a drug implies that even though the relationship may be destructive and detrimental to the narrator's well-being, they cannot escape its grasp. Overall, "Heavy Drug" depicts the struggle of being entangled in a toxic and addictive relationship where the narrator yearns for the love and attention of the other person, despite the negative consequences it brings.