In managing ulcer, GERD, acid reflux & stomach ache, using extraction from fresh guava leaves. Soak the leaves in hot boiling water probably within 15-20 minutes in order to extract out the compounds from the leaves. Let it cool and finally pour it in a tea cup. You should be able to take this guava leaf tea twice, preferably in the morning, and in the evening before sleeping. In case you want quick relief, sudden stomach ache, take 4-5 guava leaves and rubber them round in the mouth so that you can derive the benefits. Guava leaves possess chemicals that work positively when it comes to dealing with raw stomach pains, that is acidity.