List of plants poisonous to equines. Paterson's Curse has been responsible for the deaths of many horses. Many plants are poisonous to equines; the species vary depending on location, climate, and grazing conditions. In many cases, entire genera are poisonous to equines and include many species spread over several continents.
A number of prescription and over-the-counter medications can interfere with or cause loss of memory. Possible culprits include: antidepressants, antihistamines, anti-anxiety medications, muscle relaxants, tranquilizers, sleeping pills, and pain medications given after surgery. Alcohol, tobacco, or drug use.
While most changes in the brain that cause dementia are permanent and worsen over time, thinking and memory problems caused by the following conditions may improve when the condition is treated or addressed: 1  Depression. 2  Medication side effects. 3  Excess use of alcohol. 4  Thyroid problems. 5  Vitamin deficiencies.