CAT and gingival overgrowth: Catalase (CAT) levels and malondialdehyde (MDA) levels were both found to be statistically different between the group of patients taking amlodipine who developed gingival enlargement compared to the patients not taking amlodipine but who had gingival enlargement, as well as between the patients not taking amlodipine that had gingival enlargement and the patients taking amlodipine without gingival enlargement (Figure 6).