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.
1 Degenerative disease condition such as Alzheimer disease can cause amnesia. 2  Emotional trauma during childhood is another significant cause of amnesia [3].  Medications: Certain medications such as benzodiazepines can also interfere with brain functioning leading to amnesia.