Elevated GGT levels indicate that something is going on with your liver but not specifically what. In general, the higher the level the greater the “insult” to your liver. Elevated levels may be due to liver disease, but they may also be due to congestive heart failure, alcohol consumption, and use of many prescription and non-prescription drugs including nonsteroidal anti-inflammatory drugs (NSAIDs), lipid-lowering drugs, antibiotics, histamine blockers (used to treat excess stomach acid production), antifungal agents, seizure control medications, antidepressants, and hormones such as testosterone. Oral contraceptives (birth control pills) and clofibrate can decrease GGT levels.