Dried Aluminium Hydroxide can adsorb clozapine and reduce its gastrointestinal absorption. Seek immediate medical attention if you develop any of these rare but very serious side effects or symptoms of a serious medical problem: black or tarry stools, mental and / or mood changes. It is used to treat heartburn, upset stomach, sour stomach, or acid indigestion. Aluminum hydroxide is also used to reduce phosphate levels in people with certain kidney conditions. Dried Aluminium Hydroxide is very effective.