How long does tizanidine ( been taking 4mgs a day for 14 days) stay in your body, is it cumulative( like Arava) I stopped taking it 2 days ago because severe dizziness, lightheadness, nausea, no appetite problem with visual focus. This lasted all day, lessened 80% next day. Today headache , slight dizziness. Have RA & mild CP right hemiperesis & have been on biologics, dmards, NSAIDs for many years.