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Avoiding interaction: what not to mix
Warfarin to prevent blood clotting
Reacts with cranberry juice and green vegetables. Efficacy may be reduced by ice cream, soya beans and avocados, although clinical significance and prevalence of this problem is unclear
Cholesterol-lowering or immunosuppressant drugs
Patients should not drink grapefruit juice
Sedatives; other drugs including paracetamol
Should not be mixed with alcohol
Lithium to treat bipolar disorder
Patients must not vary intake of salt once they have been stabilised on the drug
Oral contraceptives; anti-depressants in the SSRI class; anti-HIV drugs
Do not mix with St John's wort, even though there is evidence that it can help treat depression too
Antibiotics in the tetracycline and quinolone classes
Milk and dairy products can reduce their effectiveness