Prickly pear cactus is also used for medicine. Prickly pear cactus is used for type 2 diabetes, high cholesterol, obesity, alcohol hangover, colitis, diarrhea, and benign prostatic hypertrophy (BPH). It is also used to fight viral infections. In foods, the prickly pear juice is used in jellies and candies.
Drooling is usually caused by excess saliva in the mouth. Medical conditions such as acid reflux and pregnancy can increase saliva production. Allergies, tumors, and above-the-neck infections such as strep throat, tonsil infection, and sinusitis can all impair swallowing.
Excessive drooling (ptyalism) is most often a sign of nausea. It can also be a sign of anxiety as someone pointed out earlier, or a sign of oral or dental disease. However, many dental and oral diseases can only be accurately diagnosed when a pet is sedated or under anesthesia, and often require dental x-rays.