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    Created in 2008, Phoenix Rising is the largest and oldest forum dedicated to furthering the understanding of, and finding treatments for, complex chronic illnesses such as chronic fatigue syndrome (ME/CFS), fibromyalgia, long COVID, postural orthostatic tachycardia syndrome (POTS), mast cell activation syndrome (MCAS), and allied diseases.

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  1. R

    Does Valtrex cause Herxheimer reaction?

    Hello all. I started on Valtrex about 2 weeks ago, as recommended by my CFS doctor. I noticed that in that time, my general functioning has on average gone from about 50% to maybe 30% on average. Prior to going on the Valtrex, I was having more bad days at 20-30%, which is why I was told to...