

Behavioral and Antihistamine Capsules for Cats and Small Pets
Product Description
Doxepin HCl 10mg Capsules are a prescription tricyclic antidepressant and antihistamine used off-label by vets for cats, small dogs, birds, and exotic animals. Working through dopamine and serotonin pathways in the brain alongside histamine H1 receptor blockade throughout the body, it handles anxiety, behavioral issues, and allergic skin disease at once. The 10mg strength is the lowest capsule option available, ideal for very small patients needing precise low-end doses.
Benefits
- Lowest Available Capsule: Gives the most accurate low-end dosing for cats, birds, and exotic species where any higher strength would be too much.
- Feline Anxiety Management: Helps cats with anxiety, psychogenic alopecia, and compulsive overgrooming at the lower doses feline patients typically need.
- Superior Antihistamine Strength: Provides significantly stronger H1 histamine blockade than standard antihistamines, offering more effective allergy itch control in small pets.
- Noise Phobia and Fear: Helps reduce fearful and phobic responses to thunderstorms, fireworks, and other startling stimuli in small dogs and cats.
- Avian and Exotic Use: Used off-label by avian and exotic vets for feather-destructive behavior and anxiety in birds and other small species.
Ingredients
Active Ingredients
Doxepin Hydrochloride
How to Use
Doxepin HCl 10mg Capsules are a prescription-only medication. A valid veterinarian prescription is required to purchase this product.
Please follow your veterinarian's specific instructions for the dosage and administration of this medication for your pet.
Disclaimer: Dosage and administration of this medication must be determined by a licensed veterinarian. Always consult your veterinarian before administering or adjusting any prescription medication for your pet.
Concealing the capsule inside a soft pill pocket or pill wrap treat is a simple and low-stress way to give this medication to small dogs or cats. This medication may be given with or without food, but always offer it alongside a small meal if vomiting occurs when given on an empty stomach. Make sure your pet always has fresh water nearby while taking this medication.
Shop Pill Pockets for Dogs | Shop Pill Pockets for Cats
Additional Information
Precautions
- Avoid With MAOIs: Keep away from pets that received selegiline, amitraz, or any MAOI in the past 14 days as a dangerous reaction can follow.
- No Amitraz Flea Collars: Amitraz flea or tick collars must never be used alongside doxepin as they carry a serious toxic interaction risk.
- Avoid Tyramine-Rich Foods: All aged cheeses and other high-tyramine foods must stay completely off the menu for the full treatment period.
- Avoid in Glaucoma: Do not give to pets with glaucoma or urinary retention as doxepin can make both of these conditions significantly worse.
- Caution in Seizures: Use with extreme caution in any animal with a prior seizure history as doxepin can lower the seizure threshold.
- Caution in Hyperthyroidism: Avoid in hyperthyroid animals as dangerous interactions with elevated thyroid hormones can develop during treatment.
- Drug Interaction Risk: Tell your vet if your pet takes cimetidine, fluoxetine, estrogens, sedatives, enalapril, verapamil, or ranitidine before starting.
Possible Side Effects
- Sedation and Drowsiness: Some pets feel sleepy or sluggish at first, but this usually settles as they adjust to the dose.
- Dry Mouth and Constipation: Reduced saliva and slower digestion can show up in some pets taking doxepin at normal doses.
- Blue-Green Urine Color: A blue-green tint in the urine can appear in some pets and clears up once the medication stops.
- GI Upset and Excitability: Some pets get unusually wound up or have stomach issues like vomiting when first starting out on doxepin.
- Cardiac Arrhythmias: Overdosing can trigger dangerous heart rhythm problems that need emergency veterinary attention as soon as they appear.
Storage Information
- Room Temperature Storage: Keep capsules in a sealed container at a steady temperature between 68°F and 77°F, well away from heat and moisture.
- Protect From Light: Sunlight and damp spots can break down the capsules over time, so keep them somewhere cool, dark, and dry.
- Keep Out of Reach: Put this medication somewhere children and untreated pets cannot get to it on their own.
Note: For generic medications, the product image shown may not reflect the actual item received. Generic medications can vary in size, color, and shape between orders depending on the manufacturer. Additionally, your medication may arrive packaged in a HardyPaw Pharmacy vial.
Shipping & Return
We offer ground, express, and priority delivery; see our shipping policy for details.
For return instructions or product concerns, please refer to our detailed refund policy.
Prescription items are NON-RETURNABLE and NON-REFUNDABLE.
Frequently Asked Questions
Q1: Why is the 10mg capsule particularly important for cats and very small animals?
Ans: Cats and very small animals need tiny amounts of doxepin, and the 10mg capsule is the only size that hits those low levels cleanly without having to split or mix anything. Cats in particular are quite sensitive to this drug class, so getting the dose spot on from the start really matters.
Q2: Has doxepin been used in birds for feather-destructive behavior?
Ans: Yes, avian vets use doxepin off-label for feather-destructive behavior in birds, which tends to have both compulsive and allergy-driven roots. The 10mg capsule is the most workable size for birds and small exotic patients. Bird dosing differs significantly from dogs and cats, so an avian vet's guidance is essential before starting.
Q3: Can the 10mg doxepin capsule be opened and mixed into food for difficult-to-medicate pets?
Ans: The vet may suggest opening the capsule and stirring the powder into a small portion of food for pets that struggle with swallowing capsules. Check with the vet first though, as the powder tastes very bitter and many pets will refuse food with it mixed in. A pill pocket or compounded flavored version often works better for reluctant patients.
Q4: How does doxepin's antihistamine effect compare to diphenhydramine for cats?
Ans: Doxepin binds to H1 histamine receptors far more strongly than diphenhydramine, making it the better pick for cats with stubborn or severe allergic itching. Diphenhydramine is a common starting point but tends to give inconsistent results in cats, whereas doxepin's stronger binding makes a real difference for cats that have not improved on standard options.
Q5: What monitoring is recommended for very small pets on doxepin treatment?
Ans: The vet will watch for excessive sedation, heart rate and blood pressure shifts, urinary patterns, and any behavioral changes suggesting the pet is not tolerating the medication well. Bloodwork at baseline and at regular intervals may be advised for pets on long-term treatment. Flag any unexpected side effects to the vet right away rather than waiting for the next scheduled visit.
Clinical Research
This Shipping Policy explains how orders are processed, shipped, tracked, and delivered.
1. Shipping Origin and Fulfillment
Orders are dispatched from our U.S.-based fulfillment center. We deliver to eligible addresses within the United States and to eligible international destinations shown at checkout.
If a destination, shipping service, or product is not eligible for delivery, checkout will not offer that shipping option.
2. Order Processing Time
Orders are generally processed within 1–5 business days before shipment. Processing time is separate from carrier transit time.
Our order cut-off time is 6:00 PM Pacific Time (PT). Orders placed after the cut-off time, on weekends, or on applicable holidays begin processing on the next business day.
Processing may include order verification and preparation for shipment.
3. U.S. Shipping Methods, Costs, and Transit Times
For eligible U.S. addresses, our current shipping options are:
- Priority Shipping: $5.99 — estimated carrier transit time of 1–2 business days after shipment.
- Standard Shipping: $2.99 — estimated carrier transit time of 3–6 business days after shipment.
- Free Shipping: $0 — estimated carrier transit time of 5–8 business days after shipment.
Total estimated delivery time includes both the 1–5 business day processing period and the applicable carrier transit time. The shipping service, cost, and delivery estimate available for your order are shown at checkout before payment.
4. International Shipping
We ship to eligible international destinations. Available international shipping services, shipping charges, and estimated delivery times vary by destination and are displayed at checkout.
For eligible international orders, applicable import duties and taxes are calculated and collected at checkout where required. When these charges apply, the order is shipped on a duties-and-taxes-paid basis so that the same import charges should not be collected again at delivery.
International delivery estimates may be affected by carrier operations, customs processing, local holidays, weather, or other events outside normal transit conditions.
5. Tracking
When tracking is available, you will receive shipment confirmation with tracking information after the order has shipped. Please allow up to 48 hours for tracking information to become active after the carrier receives the shipment.
6. Address Accuracy and Changes
Please review your shipping address carefully before submitting an order. If you notice an address error, contact us as soon as possible. We will try to help before shipment, but an address change cannot be guaranteed once fulfillment or carrier processing has begun.
Additional carrier or re-delivery charges resulting from an incorrect or incomplete address may be the customer's responsibility where permitted by law.
7. Delayed or Lost Shipments
If your shipment has not arrived within the estimated delivery timeframe, please contact us. We will review the tracking information, work with the carrier when necessary, and assist with an appropriate resolution based on the circumstances.
Delivery estimates are not guarantees and may be affected by carrier delays, weather, public holidays, customs processing, or other transportation disruptions.
8. Damaged, Defective, or Incorrect Deliveries
If an item arrives damaged, defective, or incorrect, contact us within 7 calendar days after confirmed delivery. Please include your order number and clear photos of the item, packaging, and shipping label when relevant.
Approved cases are handled under our Return & Refund Policy, including return-shipping assistance when the issue is our responsibility.
9. Policy Updates
We may update this Shipping Policy when our shipping services or operating requirements change. The current version will be posted on this page.
10. Contact Us
If you have questions about shipping or an order in transit, please use our Contact page or the current contact information displayed in the website footer.
This Return & Refund Policy explains when a return is eligible, how to send an item back, who pays return shipping, and how approved refunds are processed.
1. Return Window
You may request an eligible return within 30 days after confirmed delivery. Return requests submitted after the 30-day period are not accepted unless applicable law requires otherwise.
2. Return Eligibility
To qualify for a standard return, the item must generally be:
- Unused, unwashed, and in its original condition.
- Returned with the original packaging, tags, accessories, manuals, and other included components, when applicable.
- Not specifically identified as final sale or non-returnable before purchase.
Products that show use, alteration, avoidable damage, missing components, or other conditions outside the eligibility requirements may be ineligible for a refund.
3. Product-Specific Non-Returnable Items
Some products may be non-returnable for hygiene, safety, customization, final-sale, or other product-specific reasons. Any such restriction will be disclosed on the product page or before purchase when applicable.
4. No Direct Exchanges
We do not provide direct exchange service. If you want a different item, size, color, model, or version, return the eligible original item under this Policy and place a new order separately.
5. How to Start a Return
Returns are handled by mail. Before sending an item back, contact our customer support team through the Contact page or the current contact information displayed in the website footer. Please provide:
- Your order number.
- The item or items you want to return.
- The reason for the return.
Returns sent without required return authorization may be delayed or refused.
6. Prepaid Return Label and Return Shipping Cost
For eligible mail returns, a prepaid return label is included in the package.
For a standard return made for customer-choice reasons, the actual carrier postage charged for use of the prepaid return label will be deducted from the approved refund. We do not charge a separate restocking fee.
If the return is required because the item arrived damaged, defective, or incorrect and the claim is approved, we cover the return-label cost.
If you choose not to use the provided label when an alternative return method is authorized, use a trackable shipping service and keep your shipping receipt until the return is completed.
7. Original Shipping Charges
Original outbound shipping charges are non-refundable for standard customer-choice returns, except where required by law. If the return results from an approved damaged, defective, or incorrect item, applicable shipping charges will be handled as part of the resolution.
8. Refund Review and Processing
After the returned item is received, we inspect it and notify you whether the refund is approved.
If approved, the refund is issued to the original payment method. We generally process an approved refund within 1–3 business days. After the refund is issued, your bank or card provider may require an additional 5–10 business days to post the funds to your account.
9. Damaged, Defective, or Incorrect Items
If an item arrives damaged, defective, or incorrect, contact us within 7 calendar days after confirmed delivery. Include your order number and clear photos of the item, packaging, and shipping label when relevant.
After review, we will provide an appropriate resolution. When a return is required for an approved claim, we cover the return shipping cost.
10. Refused or Undeliverable Shipments
If a shipment is refused or returned because of incorrect or incomplete customer-provided shipping information, actual carrier return, re-delivery, or related shipping charges may be deducted from an otherwise eligible refund where permitted by law.
11. Policy Updates
We may update this Return & Refund Policy when our return procedures or legal requirements change. The current version will be posted on this page.
12. Contact Us
If you need help with a return or refund, please use our Contact page or the current contact information displayed in the website footer.
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