It is important to note that ALL SHAMPOO TREATMENTS (including prescription Nazoral) may become ineffective after a year or so of use on psoriasis. In this event, we recommend switching to our 3% salicylic acid formula (DHS Sal shampoo). Unlike other manufactures, we offer two very effective formulas for continuous, effective psoriasis therapy. If and when the DHS SAL becomes ineffective, switch back to the tar and you should see good results again. It is important to keep the bacteria in "confusion" and not let them get accustom to one treatment.
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