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Fish Doxy™ – Doxycycline 100 mg – 30 Capsules

$79.99 Regular price $89.99
Current Expiration Dates View the currently listed product families and date
Current listed expiration Selected Fish and Bird Product Families The applicable collections currently display the date shown here. 08/2027
Fish Mox & Mox Forte 08/2027
Fish Mox Clavulanate 08/2027
Fish Flex & Flex Forte 08/2027
Fish Flox & Flox Forte 08/2027
Fish Doxy 08/2027
Fish Zole & Zole Forte 08/2027
Fish Pen & Pen Forte 08/2027
Fish and Bird Zithro 08/2027
Fish Cin 08/2027
Fish Flucon 08/2027
Fish Sulfa Forte 08/2027
Fish Fungus 08/2027
Fish Levo 08/2027
Fish Min 08/2027
Inventory notice: Expiration dates may vary by supplier shipment, manufacturing batch, package quantity, strength, or variation. The date printed on the physical product received is the final product-specific expiration date.
View complete expiration information
U.S. Shipping & Delivery Review processing and estimated carrier transit times
United States Shipping Only Eligible orders are accepted and shipped only within the U.S.
Approximately One Business Day Most eligible in-stock orders are prepared after authorization.

Estimated Transit Times — When Available at Checkout

Standard & USPS
  • Free Standard Shipping 7–10 days
  • USPS Priority Mail 2–5 days
  • USPS Ground Advantage 2–15 days
FedEx Services
  • FedEx Ground 5–7 days
  • FedEx 2Day 2 days
  • FedEx Overnight Next business day
Please note: Processing time is separate from carrier transit time. Delivery estimates begin after the carrier accepts the package and are not guaranteed. Final services, prices, and estimates are displayed during checkout.
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Fish Doxy™ – Doxycycline 100 mg – 30 Capsules

Fish Doxy™ provides doxycycline hyclate 100 mg capsules in a convenient 30-capsule bottle for expressly labeled ornamental and aquarium-fish applications.

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This clearly identified product contains 100 mg of doxycycline hyclate per capsule and is supplied in a compact 30-capsule package. It is listed as USP grade and manufactured in the United States.

With more than 16 years of experience serving aquarium keepers, FishFlexFishMox is committed to clear product information, dependable sourcing, careful United States order processing, and responsive customer support.

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Fish Doxy Product Details

  • Product name: Fish Doxy™
  • Active ingredient: Doxycycline hyclate
  • Strength: 100 mg per capsule
  • Package quantity: 30 capsules
  • Product format: Capsules
  • Grade: Listed as USP grade
  • Country of manufacture: Listed as manufactured in the USA
  • Vendor: Fish Mox Fish Flex.com
  • Intended application: Expressly labeled ornamental and aquarium fish
  • Current listed expiration: 08/2027
  • Shipping coverage: United States only

Always verify the complete physical product label, active ingredient, strength, capsule count, expiration date, intended species, storage information, warnings, and current manufacturer instructions before handling or using the product.

Doxycycline Hyclate 100 mg Per Capsule

Each Fish Doxy capsule is identified as containing 100 mg of doxycycline hyclate.

The clearly displayed active ingredient and strength help distinguish this product from aquarium products containing different active ingredients, concentrations, formats, or package quantities.

Before placing an order, confirm:

  • That doxycycline hyclate is identified as the active ingredient;
  • That the strength is 100 mg per capsule;
  • That the selected package contains 30 capsules;
  • That the physical format is capsules;
  • That the intended ornamental-fish application matches the current physical label;
  • That the displayed price and package quantity are correct;
  • That the expiration information meets your purchasing requirements; and
  • That all applicable storage information, cautions, and warnings have been reviewed.

Do not select an aquarium product based only on a familiar brand name. Always review the complete product name, active ingredient, strength, capsule count, format, label information, and intended application.

Convenient 30-Capsule Bottle

This listing includes one bottle containing 30 Fish Doxy capsules.

The compact 30-capsule package is listed separately from the larger 60-count Fish Doxy option, helping customers identify the exact quantity they intend to purchase.

Before completing checkout, confirm that the cart and order confirmation display:

  • Fish Doxy™;
  • Doxycycline 100 mg;
  • 30 Capsules;
  • Capsules as the physical product format;
  • One bottle unless another package configuration is expressly stated;
  • The correct product price; and
  • The correct United States shipping destination.

The package quantity displayed in the product title, cart, checkout, order confirmation, and physical bottle determines what is included with the purchase.

30 Capsules vs. 60 Capsules

Fish Doxy doxycycline 100 mg may be offered in separately identified 30-capsule and 60-capsule package options.

  • 30 Capsules: One bottle containing 30 capsules;
  • 60 Capsules: One bottle containing 60 capsules.

Both package options may contain the same identified active ingredient and 100 mg strength per capsule. The primary differences are the total quantity included, current price, inventory availability, and potentially the production batch supplied.

This listing is specifically for the 30-capsule bottle. Customers seeking the larger quantity should select the separately listed Fish Doxy 100 mg 60-capsule product.

Never rely only on a product photograph when confirming package quantity. Review the complete product title, product details, cart, checkout page, and order confirmation.

Understanding the Fish Doxy Listing

Fish Doxy is the product-family name used for this doxycycline-based ornamental-aquarium product.

This listing should be identified using the following essential details:

  • Product family: Fish Doxy;
  • Active ingredient: Doxycycline hyclate;
  • Strength: 100 mg per capsule;
  • Physical format: Capsules; and
  • Package quantity: 30 capsules.

Products containing different active ingredients, strengths, package quantities, or physical formats should not be treated as interchangeable merely because they appear within the same broader aquarium-products category.

Browse the complete Fish Doxy (Doxycycline) collection to compare available package quantities and current product information.

USP-Grade Product

This Fish Doxy product is listed as USP grade.

The physical bottle and label supplied with the order remain the final product-specific references for:

  • The complete product name;
  • The active ingredient;
  • The strength per capsule;
  • The capsule count;
  • The manufacturer or supplier;
  • The lot or batch number;
  • The expiration date;
  • The storage requirements;
  • The intended species and application; and
  • All applicable warnings and cautions.

Review the complete physical packaging before opening or handling the product.

Manufactured in the USA

This Fish Doxy product is listed as manufactured in the United States.

Packaging design, bottle shape, label layout, branding placement, manufacturer information, and other visual details may change between production batches.

Always review the physical packaging supplied with the order to confirm that the active ingredient, strength, capsule count, intended application, lot information, expiration date, and storage instructions match the product ordered.

Current Listed Expiration: 08/2027

The current listed expiration date for Fish Doxy is 08/2027.

Expiration dates may change when new supplier shipments or manufacturing batches are received. The expiration date printed on the physical bottle supplied with the order is the final product-specific expiration date.

The 30-capsule and 60-capsule versions may come from different production or inventory batches and may therefore display different lot numbers, packaging details, or expiration dates.

A particular production batch, lot number, label design, or expiration date is not guaranteed unless it has been expressly confirmed for the applicable order.

Customers who require expiration confirmation before purchasing may contact us through our Contact Us page.

Product Label and Packaging

Fish Doxy should arrive in its original, clearly labeled bottle or supplier-approved packaging.

The physical packaging may identify:

  • The complete Fish Doxy product name;
  • Doxycycline hyclate as the active ingredient;
  • 100 mg as the strength per capsule;
  • 30 capsules as the package quantity;
  • The intended ornamental-fish application;
  • The manufacturer or supplier;
  • The lot or batch number;
  • The expiration date;
  • Storage information; and
  • Important warnings and cautions.

Manufacturers and suppliers may update packaging details without prior notice, including:

  • Bottle shape, size, or color;
  • Cap or safety-seal design;
  • Label layout;
  • Typography;
  • Logo or branding placement;
  • Manufacturer or supplier information;
  • Lot-number placement; and
  • Expiration-date placement.

The product received may therefore look different from an older photograph while still matching the essential active ingredient, strength, capsule quantity, format, supplier, and intended application displayed on the current product page.

Inspect Fish Doxy After Delivery

Before opening or using Fish Doxy, inspect the shipping package, bottle, physical label, safety seal, capsules, package quantity, lot information, and expiration date.

Do not use the product if:

  • The shipping package or bottle is substantially damaged;
  • The bottle is broken, open, or leaking;
  • A required safety seal appears missing or compromised;
  • The physical product label is missing or unreadable;
  • Doxycycline hyclate is not identified as the active ingredient;
  • The strength is not 100 mg per capsule;
  • The package quantity does not match the 30-capsule listing;
  • The expiration date has passed;
  • The capsules appear damaged, contaminated, or inconsistent with the product listing; or
  • The supplied product does not otherwise match the order confirmation.

Keep the product, shipping box, shipping label, packing materials, and order documentation. Report any issue promptly through our Contact Us page and include clear photographs of the product and shipping package.

Important Ornamental-Fish Notice

Fish Doxy is intended only for aquarium fish, ornamental fish, pet fish, or another non-human application expressly identified on the current physical label.

Unless the official product labeling expressly states otherwise, this product is:

  • For aquarium and ornamental-fish use only;
  • Not intended for human use;
  • Not intended for human consumption;
  • Not offered as a human prescription medicine;
  • Not intended for fish raised for human consumption;
  • Not intended for food-producing animals; and
  • Not a substitute for professional veterinary evaluation.

Never Use Fish Doxy for Humans

Fish Doxy and other aquarium products offered through FishFlexFishMox must never be taken, administered, or used by humans.

FishFlexFishMox does not provide:

  • Human medical advice;
  • Human diagnoses;
  • Human prescriptions;
  • Human dosage recommendations;
  • Human pharmacy services; or
  • Human treatment plans.

Anyone experiencing a human health concern should contact a licensed physician or pharmacist.

In the event of accidental exposure, ingestion, or another emergency, contact an appropriate poison-control resource or emergency service immediately.

Do Not Automatically Use Fish Products for Other Animals

A product identified for ornamental fish should not automatically be used for dogs, cats, birds, livestock, or another animal species.

Even when an active-ingredient name appears familiar, appropriate animal care may depend on the species, size, weight, age, health history, environmental conditions, other products being used, and professional veterinary evaluation.

Use this product only for its expressly identified species and application unless a qualified veterinarian provides appropriate direction and the use is permitted by applicable law.

Responsible Aquarium Care

Visible health or environmental concerns in aquarium fish may have multiple possible causes, including water-quality issues, temperature instability, filtration problems, overcrowding, stress, nutrition, parasites, injuries, or other aquarium conditions.

The presence of visible signs does not automatically mean that a doxycycline-based product is appropriate.

Before selecting or using any specialized aquarium product:

  • Test the aquarium water quality;
  • Review water temperature and recent fluctuations;
  • Check filtration and aeration;
  • Observe all affected fish carefully;
  • Review recent aquarium changes or newly introduced fish;
  • Confirm appropriate stocking conditions;
  • Consider whether sensitive plants, invertebrates, or other aquarium organisms are present;
  • Read the complete current physical product label;
  • Confirm the intended species and application;
  • Avoid combining products without professional guidance; and
  • Consult a qualified veterinarian or aquatic-animal professional when the underlying concern is uncertain.

Follow the Exact Physical Product Label

Use and handle Fish Doxy only according to the current physical product label, manufacturer information, applicable warnings, and appropriate professional guidance.

Do not rely on:

  • Information copied from an older product page;
  • Instructions supplied for another doxycycline strength;
  • Information provided for a different package quantity;
  • Instructions supplied by another manufacturer or vendor;
  • Information associated with a different active ingredient;
  • Advice from an unverified online source; or
  • Information intended for humans or another animal species.

FishFlexFishMox customer support can assist with factual product information displayed on our website but cannot diagnose an animal, prescribe a product, recommend individualized use, or create a treatment plan.

Avoid Unapproved Product Combinations

Do not combine Fish Doxy with other fish antibiotics, aquarium medications, parasite-control products, supplements, water treatments, or chemical products unless the combination is expressly supported by the applicable product information or directed by a qualified veterinarian.

Using multiple aquarium products without appropriate professional guidance may:

  • Increase the possibility of adverse effects;
  • Create product interactions;
  • Affect aquarium water conditions;
  • Affect filtration or beneficial microorganisms;
  • Reduce product effectiveness;
  • Affect sensitive fish, plants, invertebrates, or other aquarium organisms; or
  • Make it more difficult to identify the underlying concern.

Storage and Handling

Store Fish Doxy according to the information supplied on the current physical product label and packaging.

Unless different instructions are supplied, keep the product:

  • In its original labeled bottle;
  • With the container tightly and securely closed;
  • Protected from excessive heat and moisture;
  • Away from direct sunlight;
  • Away from children and unauthorized users;
  • Away from pets and other animals;
  • Separate from food and human medicines; and
  • In a secure location that helps preserve product integrity.

Do not transfer the capsules into an unlabeled bottle or container. Retain the original packaging for product identification, warnings, expiration information, manufacturer information, and lot details.

United States Shipping Only

FishFlexFishMox accepts and ships eligible orders only within the United States. International shipping is not available.

Available United States shipping methods, costs, and estimated delivery times are displayed during checkout based on the destination, package size, product eligibility, order contents, and carrier availability.

Some products or delivery methods may not be available for every state, territory, military address, P.O. Box, or other United States destination.

Review our Customer Service page for additional order-processing and shipping information.

Returns and Product Integrity

For safety and product-integrity reasons, opened, used, unsealed, altered, or partially used products are generally not eligible for return.

An eligible return must normally remain:

  • Unused;
  • Unopened;
  • In its original condition;
  • In its original labeled packaging;
  • Complete with all included materials; and
  • Authorized before return shipment.

Review our Return Policy before returning any product. Unauthorized returns may be refused.

Why Buy Fish Doxy from FishFlexFishMox?

More Than 16 Years of Experience

Fish Flex Fish Mox.com has more than 16 years of experience serving aquarium keepers seeking specialized ornamental-fish and aquarium-care products.

Learn more about our store on the About Fish Flex Fish Mox.com page.

Clearly Identified 100 mg Strength

The active ingredient, strength, capsule format, and package quantity are clearly displayed to help customers identify the correct product before purchasing.

Convenient 30-Capsule Package

This listing provides one clearly identified bottle containing 30 doxycycline hyclate 100 mg capsules.

Clear Product Information

We work to clearly display active ingredients, strengths, package quantities, product formats, vendors, expiration information, storage requirements, and important product notices.

Careful U.S. Order Processing

Eligible orders are prepared carefully after payment authorization is received and any required order verification is completed.

Responsive Customer Support

Our support team can assist with product information, package selection, expiration questions, order status, United States shipping, tracking, eligible returns, and damaged-order concerns.

Explore Related Products and Collections

Browse the complete Fish Doxy (Doxycycline) collection to compare available package quantities and related product information.

Explore our broader Fish Antibiotics collection to compare additional active ingredients, strengths, formats, and package quantities.

Review our Fish Antibiotic Expiration Dates collection for current listed expiration information.

Order Fish Doxy with Confidence

Fish Doxy™ – Doxycycline 100 mg – 30 Capsules provides a clearly identified 100 mg strength in a convenient 30-capsule bottle for expressly labeled ornamental and aquarium-fish applications.

With more than 16 years of experience, detailed product information, careful United States order handling, and responsive customer support, FishFlexFishMox is committed to providing aquarium keepers with a dependable and professional shopping experience.