Interaction with the following drugs may cause a decrease in their effectiveness:
- anticoagulants of the coumarin series (including fenprokumone, warfarin),
- cyclosporine,
- tacrolimus,
- Ditoxin,
- indinavir and other protease inhibitors used in the treatment of HIV infection,
- prinetokan, imatinib and other cytotoxic agents,
- amitriptyline, nortriptyline,
- midazolam,
- theophylline,
- other antidepressants.
Preparations containing extract of St. John's Wort, can accelerate the metabolism of drugs metabolized with the participation of cytochrome P450-3A4, CYP2C9, CYP2C19 and P-glycoprotein (including, fexofenadine, benzodiazepines and their derivatives, methadone, simvastatin, finasteride). This can weaken and / or shorten the duration of the drug. The enzyme activity returns to normal within 1 week after drug discontinuation.
In the case of simultaneous reception of some antidepressants (nefazodone, paroxetine, sertraline, buspirone or tryptans), there may be an increase in the effect of these drugs.
In some cases, side effects such as nausea, vomiting, anxiety, confusion may be more pronounced (serotonin syndrome).
Simultaneous reception with photosensitizing agents can lead to increased photosensitization. In case of concomitant treatment with other medicinal drugs that cause photosensitivity (including tetracyclines, sulfonamides, thiazide diuretics, quinolines, piroxicam and others), it is possible to enhance the phototoxic effect.
Simultaneous reception with oral contraceptives can lead to a decrease in their effectiveness and safety and the appearance of intermenstrual bleeding.
Increases the antidepressant effect of MAO inhibitors, while increasing the risk of developing hypertensive crises (not taken simultaneously with antidepressants (MAO inhibitors), the interval between admission should be at least 14 days).
When used together with fluoxetine, paroxetine, sertraline, fluvoxamine or citalopram, hemolytic reactions and the course of "serotonin syndrome" (increased sweating, tremor, dizziness, nausea, vomiting, headache, epigastric pain, anxiety, anxiety, confusion, confusion , a feeling of anxiety and irritability).
Before the planned operation, it is necessary to determine the possible interaction with the drugs used during general and local anesthesia. If necessary, stop taking the herbal medicine.
Reduces the concentration of cyclosporine in the blood.
Reduces the concentration in the blood and the effectiveness of indinavir therapy.
Before using the drug on the basis of St. John's wort extract to patients taking other medicines, it is necessary consult with your doctor.