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Thomas Labs

Thomas Labs has been a trusted name in pet medication for over 40 years. Their mission is to provide high-quality, effective treatments to keep beloved pets healthy and happy.

About Thomas Labs

For over 40 years, Thomas Labs has been a trusted leader in the production of fish antibiotics and pet medications. Their mission is to provide high-quality, effective treatments to keep aquarium fish and other pets happy and healthy.

Based in Arizona, Thomas Labs manufactures their fish antibiotics and pet meds in an FDA-approved facility under strict quality control guidelines. They offer a wide selection of antibiotics for fish, including amoxicillin, azithromycin, and many others. These are the same safe, effective antibiotics prescribed by veterinarians for pets, now available over-the-counter for fish.

In addition to fish antibiotics, Thomas Labs produces pet medications for dogs, cats, birds, and exotic animals. They are dedicated to making quality pet meds affordable and accessible. Their products are conveniently available online without a prescription.

With deep experience in the pet medication industry, Thomas Labs is a trusted source for fish antibiotics and other veterinary treatments. Pet owners can feel confident providing Thomas Labs medicines to their underwater and furry friends. The high standards and care they devote to their products is evident in every bottle that bears the Thomas Labs name.

The most popular products right now

Fish Flex Forte (Cephalexin) 500mg 30 ct

Fish Flex Forte (Cephalexin) is a broad spectrum antibiotic used to treat a wide range of non-specific bacterial infections during the most active and multiplying stages of infection.

Original Price: $25.50

Current Price: $18.50

Fish Flex Forte (Cephalexin) 500mg 100 ct

Fish Flex Forte (Cephalexin) is a broad spectrum antibiotic used to treat a wide range of non-specific bacterial infections during the most active and multiplying stages of infection.

Original Price: $51.00

Current Price: $39.99

Fish Cillin (Ampicillin) 250mg 100 ct

Fish Cillin (ampicillin) exerts a bactericidal action on gram-positive and some gram-negative bacteria. Useful for control of some common bacterial diseases of fish including Aeromonas and Pseudomonas genera and Mycobacterial group (gill diseases, chondrococcus).

Original Price: $45.00

Current Price: $31.35

Fish Pen Forte (Penicillin) 500mg 100 ct

Fish Pen Forte (penicillin) is an antibiotic that exerts a bactericidal action on gram-positive and some gram-negative bacteria in fish. It is useful for control of some common bacterial diseases in fish, including caused by bacteria such as fin and tail rot and flexibacter infections.

Original Price: $51.00

Current Price: $42.99

Fish Zole Forte (Metronidazole) 500mg 30 ct

Fish Zole Forte (Metronidazole) Very effective in the fight against protozoan, hole in the head disease, internal hezamita (Malawi bloat), freshwater ICH and pon epistyles. Metronidazole also exerts a bactericidal action on gram positive and some gram negative bacteria. Useful for control of some common bacterial fish diseases including aeromonas and psedomonas genera and mysobacterial group (gill diseases, chondrococcus).

Original Price: $51.00

Current Price: $48.99

Fish Zole (Metronidazole) 250mg 100 ct

Fish Zole (Metronidazole) is an antibiotic that is used for parasitic and bacterial infections in fish. It is effective against anaerobic bacteria (bacteria that grow only where there is no oxygen). This fish antibiotic exerts a bactericidal action on gram-positive and some gram-negative bacteria in fish. It is useful for control of some common bacterial diseases in fish, including diseases caused by bacteria such as Aeromonas, Pseudomonas, and Mycobacterial (Gill diseases and Chondrococcus). This fish medication is also used to control diseases caused by parasites, including diseases caused by organisms such as Cryptocaryon irritans, Ichthyophthirius multifiliis, and Hexamita.

Original Price: $65.99

Current Price: $54.99

Why Choose Thomas Labs

Rigorous Quality Standards

Their FDA-approved facility adheres to strict guidelines for quality control and good manufacturing practices. You can trust their products are carefully formulated and tested.

Trusted by Veterinarians

The antibiotics and pet meds they offer are the same safe, effective ones prescribed by vets. Now pet owners can access these trusted treatments over-the-counter.

Wide Selection

Thomas Labs offers an extensive range of fish antibiotics like amoxicillin and azithromycin as well as medications for dogs, cats, birds, reptiles and more.

Affordable Pricing

Their online prices on premium pet medications are highly affordable compared to prescription costs.

Convenient Access

No prescription is required, so you can conveniently order the pet meds you need and have them delivered to your door.

Proven Results

Thomas Labs products have successfully treated countless aquarium fish, dogs, cats and exotic pets over 40+ years, with pet owners seeing the quality results firsthand.

Hear what customers say

As both an aquarium enthusiast and a dog owner, I rely on Thomas Labs for quality medications for all my pets. I've used their fish antibiotics like amoxicillin many times to clear up bacterial infections in my fish over the years. The antibiotics work fast and save me money compared to those from the vet. More recently, my labrador retriever came down with an ear infection. I ordered Thomas Labs doggie ear drops, and within a week his infection was gone! Their products are easy to administer and really effective. I'm so glad I can conveniently order them online without even needing a prescription. Thomas Labs is a trusted name in my household when it comes to pet meds.
John Smith
John Smith
Any fish owner knows, aquarium fish are sensitive and getting antibiotics into them can be tricky. But with Thomas Labs sensitive-digestion fish antibiotics, I finally found a product my angelfish and neon tetras can tolerate! Many antibiotics upset their digestive systems, but these ones go down easy with their food. Since using Thomas Labs products, my fish are staying healthy and thriving. Their food-based antibiotics make medicating my fish so much easier compared to force-feeding tablets. I really appreciate that Thomas Labs caters their formulations specifically to fish. Their antibiotics get the job done without stressing my fish out. Top quality meds!
Emily Davis
Emily Davis
As the owner of three large parrots, I've relied on Thomas Labs bird antibiotics numerous times over the past 5 years when my feathery friends have needed medication. The avian antibiotics are very effective and easy to mix into their food or water. I also love that Thomas Labs offers sizable quantities of the bird medications so I can keep some on hand for whenever my parrots might need it. Their prices are far cheaper than what my exotic vet charges too! Having these quality bird antibiotics readily available provides me peace of mind as a bird owner. Thomas Labs really looks out for the needs of pet owners. I won't buy my exotic pet meds from anyone else!
James Wilson
James Wilson
The gleeful bubbly sounds of my aquarium instantly calms me after a stressful day. So when my prize koi fish started showing signs of illness, I turned to Thomas Labs for their specialized koi medications. After a short course of their koi antibiotic and anti-parasitic meds, my koi was back to normal and the tank peaceful again. Thomas Labs is clearly experienced in koi fish care. Their koi meds are gentle yet highly effective. Now I keep a supply of the Thomas Labs koi meds on hand for any future issues. I'm grateful I can order directly online instead of needing a prescription. For quality aquarium fish medications, Thomas Labs is the way to go. My fish mean the world to me, so I choose only the best for them.
Samantha Brown
Samantha Brown
As a veterinarian, I often recommend Thomas Labs medications to pet owners for their effectiveness and affordability. The pet meds from Thomas Labs are the very same ones I dispense for animal patients, just available at lower online prices. Whether it's antibiotics, anti-inflammatories, antifungals or other treatments, Thomas Labs products work beautifully. I feel confident prescribing their pet medicines to my clients. And I love that owning pets is more affordable for my clients now that they can bypass my clinic's dispensing fees and order meds directly from Thomas Labs online. Thomas Labs has surely helped many pets over the years by making quality medications accessible. I'm pleased to trust their products in my own veterinary practice.
Michael White
Michael White
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FAQs

Thomas Labs provides a wide selection of fish antibiotics, including popular medications like amoxicillin, azithromycin, cephalexin, metronidazole, and more. They offer just about any antibiotic an aquarium hobbyist could need.

Yes, Thomas Labs manufactures their fish antibiotics and pet meds in an FDA-registered facility under strict quality control guidelines. This ensures the products are safe and effective.

No, a prescription is not required. Their fish antibiotics and pet medications can be purchased directly online without a prescription.

In addition to fish antibiotics, Thomas Labs offers medications for dogs, cats, birds, reptiles, and exotic pets. Their products are safe when used as directed.

Thomas Labs has over 40 years of experience developing quality pet medications. They have a long-standing reputation in the industry.

By selling direct online and avoiding prescription dispensing fees, Thomas Labs passes the savings on to the customer with lower prices.

Orders are processed and shipped rapidly, usually within 1 business day! Fast shipping ensures your pet gets the medicine they need without delay.

If you are not 100% satisfied with any product, you can return unused portion for a full refund or exchange within 30 days of purchase.

Yes, when used as directed Thomas Labs antibiotics are safe for treating infections in ornamental and aquarium fish species. The products are formulated specifically for fish.

Their U.S. headquarters and manufacturing facility are in Arizona. Products ship from their Arizona warehouse.