Aquarium Sulfamethoxazole/Trimethoprim 960mg is a dual-action fish antibiotic containing 800mg of sulfamethoxazole and 160mg of trimethoprim per tablet. The 100-tablet bottle is optimized for searches such as Fish Sulfa 960mg, SMZ-TMP for fish, aquarium sulfa antibiotic, and sulfamethoxazole trimethoprim fish medication. Rather than presenting 960mg as one ingredient, the title and label make the two-part formula explicit so experienced aquarists can distinguish it from single-agent sulfa products.
Sulfamethoxazole Trimethoprim 800mg/160mg: product details
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Active ingredient: Sulfamethoxazole Trimethoprim
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Strength: 800mg/160mg per tablet
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Package: 100 Tablets
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Product category: Aquarium fish antibiotic or antimicrobial
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Intended animals: Ornamental aquarium fish only
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System context: Freshwater or saltwater use only when supported by the product label
Common aquarium searches and condition context
This product is commonly researched in connection with the following aquarium-health terms. The list describes search and selection context; it is not a diagnosis and does not mean every case will respond to this ingredient.
- persistent fin rot
- mixed bacterial infection
- ulcers
- dropsy
- gill disease
- Aeromonas
- Pseudomonas
- susceptible gram-positive bacteria
- susceptible gram-negative bacteria
Two ingredients, one linked pathway
Sulfamethoxazole and trimethoprim interrupt successive steps in bacterial folate production. That sequential blockade is the defining feature of SMZ-TMP and the reason it is described as a synergistic combination. In ornamental-fish discussions, it is associated with susceptible gram-positive and gram-negative organisms, including bacteria linked with gill and skin disease. The combination does not make the product universal; fungus, viruses, parasites, and water-quality injury still require different responses.
Search intent: persistent and mixed bacterial signs
Aquarists often arrive at Fish Sulfa searches after persistent fin rot, recurring ulcers, red inflammation, swelling, gill irritation, or a mixed external and systemic presentation. These signs require more than keyword matching. Check whether the fish recently shipped, fought, spawned, experienced a temperature swing, or lived through an ammonia or oxygen event. A recurring infection commonly signals an unresolved environmental or husbandry problem rather than an insufficiently strong medicine.
Understanding the 960mg label
Each tablet totals 960mg: 800mg sulfamethoxazole plus 160mg trimethoprim. The bottle contains 100 tablets for large collections, multiple quarantine systems, or carefully managed inventory. Record both active ingredients in treatment logs, because writing only “sulfa” can create confusion later. Avoid combining it with another product that contains the same or a related sulfonamide unless a qualified professional has reviewed the entire plan.
Hospital-tank checkpoints
Use actual water volume, not nominal tank capacity. Provide vigorous aeration and stable temperature, and keep ammonia and nitrite at zero. Remove waste before it decomposes, but avoid dramatic parameter changes that add stress. Follow the package instructions concerning carbon, UV, water changes, and redosing. Because biological filtration can react unpredictably during antibiotic exposure, keep conditioned replacement water ready and test more frequently than during normal maintenance.
Know when to escalate
If ulcers deepen, breathing worsens, red streaking spreads, the fish loses equilibrium, or new fish become affected, stop relying on retail symptom comparisons. An aquatic veterinarian can distinguish bacterial disease from parasites and can identify susceptibility through culture. That is especially important after a prior antibiotic has failed, because resistance, incorrect route, inadequate exposure, or an entirely different diagnosis may be responsible.
Frequently asked questions
Does 960mg mean 960mg of sulfamethoxazole?
No. It is the combined total of 800mg sulfamethoxazole and 160mg trimethoprim.
Is Fish Sulfa a parasite treatment?
It is an antibacterial combination. Do not assume it treats Ich, velvet, flukes, or worms without product-specific evidence and professional guidance.
Essential safety information
For ornamental aquarium fish only. Not for human use, not for veterinary use in mammals, and not for fish intended for human consumption. Keep out of reach of children and household pets. Use only according to the original product label and applicable law. Do not begin treatment solely from a search result. Confirm water quality and seek an aquatic veterinarian or qualified fish-health professional for severe, uncertain, recurrent, or rapidly progressing disease.
