hello thank you for trusting HCM Dear Lisinopril produced a significant alteration in smell recognition, or olfactory or taste threshold by unknown mechanism.but in old age the pailla on the tongue may alter may cause altered taste sensation. use make sure you brush your teeth thoroughly and scrape your tongue as well. Do this upon waking, after you take your medication, and several times throughout the day as needed. Create a paste that consists of a teaspoon of baking soda, a teaspoon of hydrogen peroxide, and a half teaspoon of toothpaste. Use this blend on your tooth brush or as a rinse. Cranberry juice, orange juice, coffee, and herbal teas can overpower any lingering residue that is left behind in your mouth. Citrus fruits are not only beneficial for your immune system. They’ll also override that bad taste in your mouth. After brushing or taking your medicine, you can pop a piece of gum in your mouth. Not only will it help you to combat the metallic residue that may be left behind, you will also be taking care of your teeth as food debris is cleared away. You can also chew cloves, mint leaves, or cardamom. Hard candies, especially mint or cinnamon, are helpful as well. Choose sugarless varieties for a healthier option. if your symptoms not improved please consult your doctor he will examine and treat you accordingly. I think I answered to your question if you have more questions feel free to ask. take care