Drugs: NexGard, NexGard COMBO
FDA authorizes emergency pet treatment for New World screwworm
100% citation coverage1 regulatory sources
Intelligence Snapshot
Executive Summary
The FDA has issued Emergency Use Authorizations for NexGard and NexGard COMBO to treat New World screwworm in dogs and cats .
Key Insights
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Nitenpyram tablets are authorized for emergency use in pets weighing at least two pounds…
Nitenpyram tablets are authorized for emergency use in pets weighing at least two pounds and at least four weeks old .
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The FDA authorized a generic over-the-counter drug to treat New World screwworm in dogs…
The FDA authorized a generic over-the-counter drug to treat New World screwworm in dogs and cats .
Market Impact
| Regulatory | high |
|---|---|
| Commercial | high |
| Competitive | medium |
| Investment | high |
The FDA issued Emergency Use Authorizations for NexGard and NexGard COMBO to treat New World screwworm in dogs and cats. Reuters also reported emergency use for nitenpyram tablets in pets meeting weight and age thresholds.
Quick Answer
Key Questions
- What is New World screwworm and why does it matter for pets?
- Which drugs are authorized and how do they differ?
- Are these drugs available over the counter?
- How long will these emergency authorizations remain in effect?
- What species are covered by these authorizations?
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FDA Authorizes Emergency Pet Treatment for New World Screwworm
Key Takeaways
- The FDA has issued Emergency Use Authorizations for NexGard and NexGard COMBO to treat New World screwworm in dogs and cats.
- Nitenpyram tablets are authorized for emergency use in pets weighing at least two pounds and at least four weeks old.
- The FDA authorized a generic over-the-counter drug to treat New World screwworm in dogs and cats.
IntelligenceRegulatory Impact
FDA decisions frame this story. Regulatory relevance is high for New World screwworm, with NexGard and NexGard COMBO most exposed. Track designations, submission types, and label or guidance shifts that could move timelines.
What the FDA Authorized
The FDA has issued Emergency Use Authorizations for two drugs to treat New World screwworm (NWS) in dogs and cats. The chewable tablets, NexGard and NexGard COMBO, can be used as treatment for the harmful parasite in dogs and cats respectively.
In parallel, the agency authorized nitenpyram tablets, a fast-acting treatment, for use in pets weighing at least two pounds and at least four weeks old. The FDA issued an Emergency Use Authorization for a generic over-the-counter drug to treat New World screwworm in dogs and cats.
IntelligenceMarket Signals
Commercial pull is high and investment relevance high for New World screwworm. Expect implications for pricing, access, and launch sequencing.
Regulatory Context
Emergency Use Authorizations bypass standard approval timelines when public health or animal health emergencies warrant faster access to treatment. The FDA's activation of this pathway for New World screwworm treatment signals the agency's recognition of the need for rapid access to these interventions. The authorizations cover chewable formulations alongside fast-acting tablet options, expanding the portfolio of available New World screwworm treatment modalities for companion animals.
IntelligenceStrategic Takeaways
The FDA has issued Emergency Use Authorizations for NexGard and NexGard COMBO to treat New World screwworm in dogs and cats . Nitenpyram tablets are authorized for emergency use in pets weighing at least two pounds and at least four weeks old . The FDA authorized a generic over-the-counter drug to treat New World screwworm in dogs and cats .
Screwworm Prevention in Dogs and Treatment Strategies
The authorized treatments address an immediate clinical need. NexGard and NexGard COMBO are chewable tablets designed for dogs and cats, respectively, providing veterinarians and pet owners with branded formulation options. The inclusion of nitenpyram tablets, which can be used in pets weighing at least two pounds and at least four weeks old, extends accessibility to a broader patient population and offers flexibility in treatment selection for different animal weights and ages.
IntelligenceEvidence Quality
Grounded in 1 regulatory source.
What to Watch
The evidence currently available does not disclose commercial forecasts, reimbursement coverage timelines, adoption rates, or post-authorization surveillance data. Stakeholders should monitor FDA and APHIS communications for updates on treatment efficacy data from field use and any modifications to the emergency authorization terms. Future regulatory guidance may clarify how these emergency authorizations transition to standard approval pathways or whether additional New World screwworm treatment options receive authorization.
Frequently Asked Questions
What is New World screwworm and why does it matter for pets?
New World screwworm (NWS) is a parasitic infestation caused by larvae of the fly Cochliomyia hominivorax. The evidence map does not provide epidemiological detail on prevalence, geographic distribution, or clinical severity in companion animals; however, the FDA's emergency authorization pathway indicates the infection warrants rapid access to treatment options.
Which drugs are authorized and how do they differ?
NexGard and NexGard COMBO are authorized as chewable tablets for dogs and cats, respectively. Nitenpyram tablets are also authorized for pets weighing at least two pounds and at least four weeks old. The specific clinical or pharmacological distinctions between these formulations are not detailed in the available evidence.
Are these drugs available over the counter?
The FDA authorized a generic over-the-counter drug to treat New World screwworm in dogs and cats. Individual state regulations and veterinary practice standards may apply additional requirements.
How long will these emergency authorizations remain in effect?
The evidence does not specify expiration dates, renewal criteria, or conditions for transition to standard approval. Further updates from the FDA or APHIS would clarify the timeline and any conditions governing these authorizations.
What species are covered by these authorizations?
The authorizations cover dogs and cats. The available evidence does not address treatment in other species.
What does the evidence reveal about New World screwworm treatment options?
The authorized emergency treatments represent the current regulatory response to New World screwworm in companion animals. The evidence confirms that multiple formulations—both branded chewables and generic tablets—are now available through emergency authorization. No clinical trial data, efficacy comparisons, or long-term surveillance findings are included in the available evidence regarding these specific New World screwworm treatment approaches.
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- Sources analyzed
- 1
- Evidence strength
- 76/100
- Last verified
- Jun 16, 2026
- AI-assisted review
- Yes
- Editorial review
- Dr. Sarah Chen
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