The most commonly used behavior-modifying drug classes in veterinary practice are benzodiazepines (BZDs), tricyclic antidepressants (TCAs), selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors, serotonin 2A antagonist/reuptake inhibitors (SARIs), and alpha-2 agonists. Specific agents within each class are listed below with available dosing guidance. AAHA Clinical G…
BZDs used in dogs and cats include alprazolam, diazepam, midazolam, lorazepam, and clonazepam. BZD dosing is highly individualized, and trial and error is required to find the optimal dose for each patient. They are administered 1–2 hours before a stressor and repeated 30 minutes before the event, with whole or half-dose increments used to titrate effect. For patients that do not accept tablets, BZDs can be made into a paste with a small amount of liquid and applied directly to the gums or tongue. All BZDs in this class can be dosed every 12–24 hours or as needed for veterinary visits. AAHA Clinical G… Specific mg/kg doses for individual BZDs are not provided in the available guidelines; formulary verification is required before prescribing.
TCAs used in dogs and cats include amitriptyline, nortriptyline, clomipramine, imipramine, and doxepin. SSRIs include fluoxetine, paroxetine, sertraline, fluvoxamine, citalopram, and escitalopram. Dual serotonin-norepinephrine reuptake inhibitors include venlafaxine and duloxetine. SARIs include trazodone and nefazodone. AAHA Clinical G… Specific mg/kg doses for these agents are not provided in the available guidelines; formulary verification is required before prescribing.
For fear-related veterinary visits specifically, suitable pre-visit medications include BZDs, gabapentin, trazodone, clonidine, and dexmedetomidine (an alpha-2A agonist), with atipamezole available as a reversal agent for dexmedetomidine. All of these agents can be administered every 12–24 hours or as needed. AAHA Clinical G… Gabapentin has evidence supporting its use as a behavioral modifier and stress reducer in cats when given several hours prior to hospital visits, though sedation is a noted adverse effect. AAHA Clinical G…
For mild sedation of cats specifically, oral chlorpheniramine given every 12–24 hours or phenobarbital given 1 hour prior to travel (repeated during travel if needed) are appropriate options. Maropitant citrate, dosed by weight in tablet form 1–2 hours before an appointment, is approved for use in dogs and addresses nausea associated with travel. AAHA Clinical G…
⚠️ Formulary note: Specific mg/kg doses for the majority of these agents are not reported in the available guidelines. Doses vary by indication, species, and individual patient factors. Verify all doses against a current veterinary formulary (e.g., Plumb's) before prescribing.
| Drug/Class | Route & Frequency | Key Indication | Key Caveat |
|---|---|---|---|
| BZDs (alprazolam, diazepam, midazolam, lorazepam, clonazepam) | PO; 1–2 hr before stressor, repeat 30 min before; q12–24h or PRN | Fear/anxiety, veterinary visits | Highly individualized dosing; titrate by half- or whole-dose increments AAHA Clinical G… |
| Gabapentin | PO; several hours before visit | Stress reduction in cats; veterinary visits | Sedation noted; limited analgesic efficacy data in dogs AAHA Clinical G…+1 |
| Trazodone (SARI) | PO; q12–24h or PRN | Fear/anxiety, veterinary visits | Specific mg/kg dose not in available guidelines AAHA Clinical G… |
| Clonidine | PO; q12–24h or PRN | Fear/anxiety, veterinary visits | Specific mg/kg dose not in available guidelines AAHA Clinical G… |
| Dexmedetomidine (alpha-2A agonist) | Per label; q12–24h or PRN | Sedation/anxiolysis; combinable with above agents | Reversible with atipamezole AAHA Clinical G… |
| Chlorpheniramine | PO; q12–24h | Mild sedation in cats | Specific mg/kg dose not in available guidelines AAHA Clinical G… |
| Phenobarbital | PO; 1 hr before travel, repeat PRN | Mild sedation in cats for travel | Specific mg/kg dose not in available guidelines AAHA Clinical G… |
| Maropitant citrate | PO; weight-adjusted, 1–2 hr before appointment | Travel nausea in dogs | Approved for dogs; not listed for cats in this context AAHA Clinical G… |
| TCAs (amitriptyline, clomipramine, etc.) | Per formulary | Chronic behavioral conditions | Specific mg/kg doses not in available guidelines AAHA Clinical G… |
| SSRIs (fluoxetine, paroxetine, etc.) | Per formulary | Chronic behavioral conditions | Specific mg/kg doses not in available guidelines AAHA Clinical G… |
Would you like guidance on which of these agents are appropriate for long-term daily dosing versus situational/event-based use?