I was just reading about it, and saw that it can cause diarrhea (btw: when I have Spelling Bee nightmares, the word I get in the nightmare is diarrhea because I can NEVER spell it without spell-check). Jude had a soft stool this morning

, so that's another reason I probably should discontinue it. Here's what I'm reading, and it says it helps with mood stabilizing and calming, so maybe it's an alternative for you:
Brand Names and Other Names of Trytophan
- L-tryptophan has limited availability for use in humans but is obtainable in combination with other substances for use in animals. 5-HTP is available OTC in US pharmacies and is marketed for use in humans
- Human formulations: Various generic preparations
- Veterinary formulations: Nutricalm® (Rx Vitamins)
Uses of Tryptophan for Dogs and Cats
- Tryptophan and 5-HTP have been used to decrease aggression and impulsivity in dogs and cats. They also have both mood stabilizating and calming effects.
- Tryptophan and 5-HTP have also been used as a primary or adjunctive treatment to palliate obsessive-compulsive disorders.
Precautions and Side Effects
- While generally safe and effective when prescribed by a veterinarian, tryptophan can cause side effects in some animals.
- Tryptophan should not be used in animals with known hypersensitivity or allergy to the drug.
- The most common side effects are vomiting and diarrhea. Unwanted gastrointestinal effects may result from the drug’s known stimulatory effects on propulsive contractions of dogs’ proximal small intestine.
- Tryptophan may interact with other medications. Consult your veterinarian to determine if other drugs your pet is receiving could interact with tryptophan. Such drugs include certain antidepressants and other “behavior modifying drugs,” as the effects may be additive.