Common Name: Sarcolactic Acid Causes & Symptoms for SBL Acidum Sarcolacticum Sarcolacticum Acidum is useful in general conditions like muscular prostration which is worse from exertion.  There is sore feeling all over and is worse in the afternoon.  It also helps in restlessness at night and difficulty in getting sleep. There is tired feeling in morning on getting up. Sarcolacticum Acidum is also useful for tired feeling in back, neck and shoulders