Unfortunately, the smell from a dead animal can take weeks and sometimes months to disappear. The problem with dead animals in a wall or somewhere in your house is that the dead tissue breaks down and the decaying tissue produces liquids that can seep into the wood in your walls and floor.
The following drugs, medications, substances or toxins may possibly cause Bitter tastes as a side effect. [ See detailed list of 23 drug side effect causes of Bitter tastes 1  ]. Sinemet. 2  Sinemet CR. 3  Lodosyn.
Other factors that may cause taste change include: 1  A dry mouth. 2  Loss of smell. 3  Much of what is thought of as taste is actually smell. 4  Minor infections, such as a cold or flu. 5  Cigarette smoking or the use of smokeless (spit) tobacco.