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PubMed But you should consult a dermatologist, especially for oral use

Other studies have consistently demonstrated that hyperglycemia is associated with low levels of glutathione in those with uncontrolled diabetes

ketoconazole), and protease inhibitors (e.g., ritonavir), may result in an increase in codeine plasma concentrations , with subsequently greater metabolism by cytochrome CYP2D6, resulting in greater morphine levels, which could increase or prolong adverse reactions and may cause potentially fatal respiratory depression, particularly when an inhibitor is added after a stable dose of acetaminophen and codeine phosphate tablets is achieved [see WARNINGS]

Rodrigues C et al