A double-blinded randomized controlled trial of silymarin for the prevention of antituberculosis drug-induced liver injury

Chote Luangchosiri, Ammarin Thakkinstian, Sermsiri Chitphuk, Wasana Stitchantrakul, Supanna Petraksa, Abhasnee Sobhonslidsuk, Chote Luangchosiri, Ammarin Thakkinstian, Sermsiri Chitphuk, Wasana Stitchantrakul, Supanna Petraksa, Abhasnee Sobhonslidsuk

Abstract

Background: Hepatitis is a common adverse effect of antituberculosis drugs. Silymarin prevented drug-induced hepatoxicity in animals with anti-oxidative mechanisms but its effect in human has been unknown. We aimed to evaluate the efficacy of silymarin for preventing antituberculosis-drug induced liver injury (antiTB-DILI) in patients with tuberculosis.

Methods: A double-blind randomized placebo-controlled trial was performed. Tuberculosis patients were randomly allocated to receive placebo or silymarin. The outcomes of interests were antiTB-DILI and the maximum liver enzymes at week 4. Antioxidative enzymes (i.e., superoxide dismutase (SOD), glutathione and malondialdehyde assays) were assessed. The risks of antiTB-DILI between the two groups were compared. A number need to treat was estimated.

Results: A total of 55 out of 70 expected numbers of patients were enrolled. There were 1/27 (3.7%) and 9/28 (32.1%) patients who developed antiTB-DILI in the silymarin and the placebo groups. Risk reduction was 0.28 (0.10, 0.47), i.e., receiving silymarin was 28% at lower risk for antiTB-DILI than placebo. This led to prevention of 28 patients from being antiTB-DILI among 100 treated patients. Median (IQR) of ALT levels at week 4 in the placebo and the silymarin group were 35.0 (15, 415) IU/L and 31.5 (20, 184) IU/L (p = 0.455). The decline of SOD level at week 4 in the silymarin group was less than the placebo group (p < 0.027).

Conclusions: Silymarin reduced the incidence of antiTB-DILI. The benefit of silymarin may be explained from superoxide dismutase restoration. Larger clinical trials are required to confirm the result of our small study [Clinicaltrials.Gov Identifier Nct01800487].

Trial registration: ClinicalTrials.gov NCT01800487.

Figures

Fig. 1
Fig. 1
Protocol flow chart. New patients with pulmonary tuberculosis were assessed for protocol eligibility
Fig. 2
Fig. 2
Mechanisms of action of silymarin. The positive effects of silymarin on the liver are originated from hepatoprotection, antioxidation, antiinflammation, antifibrotic activity, the promotiion of liver regeneration and immunomodulation [17, 18, 31]

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