Abstract: The invention is an aqueous suspension of sucralfate (sucrose sulfate aluminum salt), which is added with a starch and/or a derivative thereof and preferably further with a cellulose derivative, polysaccharide gum, alginic acid, alginate and/or bentonite, whereby the suspension is made stable for a long time and may be redispersed if necessary. The invention can thus provide a liquid pharmaceutical preparation useful for protecting ulcer areas on mucous membranes of the stomach and duodenum industrially for the first time, although solid pharmaceutical preparations have been available.