Positives

• One ME/CFS patient described ultra-low-dose doxepin (Silenor 3 mg or 6 mg) as “a life-saver” for staying asleep through the early-morning hours, and noted that even 1 mg of the liquid elixir was enough to produce a sedative effect via the drug’s potent H1 antihistamine activity Phoenix Rising.
  
  

Negatives

• A user reported that doxepin worked well at first but caused significant weight gain — about ten pounds in two weeks — when she tried it again the following year, and the sleep benefit had also disappeared on the second attempt Phoenix Rising.
  
  
• Forum members repeatedly noted that doxepin is effective for sleep but often causes next-day grogginess and that intermittent dosing can help manage both the grogginess and the weight-gain side effect Phoenix Rising.
  
  

Hurdles & Side Effects

• At the sub-antidepressant sleep doses commonly used in the ME/CFS community (1 to 10 mg), doxepin’s sedation comes almost entirely from H1 blockade rather than its higher-dose antidepressant mechanism; forum members generally use the compounded liquid elixir rather than the branded Silenor tablet to titrate more precisely Phoenix Rising.