Hydroxyzine (/haÉªËdrÉksáµ»ziËn/) is a first-generation antihistamine of the diphenylmethane and piperazine class. It was first synthesized by Union Chimique Belge in 1956 and was marketed by Pfizer in the United States later the same year, and is still in widespread use today.
One common cause of muscle aches and pain is fibromyalgia, a condition that causes tenderness in your muscles and surrounding soft tissue, sleep difficulties, fatigue, and headaches. The most common causes of muscle aches and pains are: Injury or trauma, including sprains and strains.
Common causes of fatigue include: 1  Inadequate sleep. 2  Anxiety and depression. 3  Increased energy exertion secondary to movement problems.  Reduced stamina and 1  deconditioning. Secondary to medicines for movement, pain, mood.  A primary symptom of the disease itself.