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Concurrent therapy with isotretinoin and vitamin A must be avoided as symptoms of hypervitaminosis A may be intensified.
Rare cases of benign intracranial hypertension 'pseudotumor cerebri' have been reported after isotretinoin and after tetracyclines. Supplementary treatment with tetracyclines should therefore be avoided.
The effect of microdosed progesterone preparations may be diminished by interaction with isotretinoin. Therefore microdosed progesterone preparations should not be used.
