I have some info on what Anakat advised i am also looking up Lobelia root to see if Pregnant cats are aloud to have this herb. before air flights Lobelia has been givin to my animals for stress releif..
If you are fortunate to have a local homeopathic practitioner, he or she can formulate a homeopathic remedy for either the aggressor or the victim cat. Two other readily available "OTC" aids are:
Although not actively marketed for this purpose, this pheremone-based product has been cited anecdotally as helping calm the atmosphere between aggressive feline housemate. Feliway was formulated to closely approximate the "friendly" facial pheremones cats use to mark their territory. The Feliway Plug-In plugs into an electrical socket and diffuses the pheremone throughout a room. It is available online, and in most pet supply stores.
Bach's Flower Essences, particularly Rescue Remedy are widely used for stressful situations. A drop or two in the cats' water dish each day may have a calming effect on your combatants. Flower essences are available in some pet supply stores and in many health food stores.
1) Bach Flower Rescue Remedy
Bach Flower Essences are made with a 3-step process, and the resultant essences are usually mixed with water (4-5 drops in a pet's water bowl), although they can be applied directly to the skin. Rescue Remedy contains Star of Bethlehem, Clematis, Cherry Plum, Impatiens, and Rock Rose, and the combination is useful for stressful situations.
2) Anxiety/Fear Flower Essences
Prepared by Pet Essences, Anxiety/Fear Flower Essences are designed to help with nervousness and anxiety caused by sudden environmental changes, such as thunderstorms, noisy holidays, new people or pets in the household, or trips to the veterinarian. Contains Aspen, Impatiens, Red Chestnut, Mimulus, and other natural flowers, and may be administered by adding to drinking water, or gently rubbed into the skin of the ears, lips, or paws.
3) Vetri-Science Composure Liquid
Composure Liquid may help with urine marking, compulsive grooming, hyperactivity, or quivering and trembling; all possibly symptoms of stress and anxiety. Active ingredients are L-Theanine, Thiamin, Lecithin, and Decapepetide. As with all medications, discontinue immediately if your cat's symptoms worsen, and contact your veterinarian.
4) Calming Solution Flower Essences
This Pet Essences product can be used for cats who have difficulty calming down, who are high strung, or overly possessive. The manufacturer recommends giving several times a day for a cat that is particularly upset. Ingredients: Cherry Plum, Chamomile, Quaking Grass, Vervain, and other natural flowers.
5) LoveMyPet Stress Relief
An herbal formula used for calming pets in noisy or unfamiliar situations (think fireworks, thunder, and travel). This holistic remedy contains organic herbs, including organic skullcap, passion flower, oatstraw, schizandra and homeopathic ingredients.
The formulator is Martha Benedict, who was trained in China and has been creating herbal mixtures for pets for over 25 years. Like flower essences, LoveMyPet Stress Relief is usually given mixed with water.
6) HomeoPet Anxiety
Homeopathic remedy for calming noise and change-based anxiety. Ingredients: Chamomilla, Valeriana, Borax, Cypripedium Pubescens, Ignatia Amara, Colochicum Autumnale, Veratrum Album; in purified water.