{"product_id":"fish-pen-penicillin-500mg-fish-antibiotic-30-60-tablets","title":"Fish Pen Penicillin 500mg Fish Antibiotic – 30 \u0026 60 Tablets","description":"\u003cdiv class=\"product-description\"\u003e\n\n  \u003cp\u003e\u003cstrong\u003eFish Pen Penicillin 500mg\u003c\/strong\u003e is a powerful, bactericidal \u003cstrong\u003efish antibiotic\u003c\/strong\u003e formulated to fight common bacterial infections in freshwater and saltwater aquarium fish. Each tablet contains \u003cstrong\u003e500mg of penicillin V potassium\u003c\/strong\u003e, an established beta-lactam antibiotic with strong activity against susceptible gram-positive and certain gram-negative bacteria.\u003c\/p\u003e\n\n  \u003cp\u003eAlso commonly searched as \u003cstrong\u003eFish Pen Forte\u003c\/strong\u003e, this aquarium antibiotic is used to treat \u003cstrong\u003efin rot, tail rot, columnaris, Flexibacter infections, bacterial gill disease, infected eyes, popeye, skin ulcers, open wounds and other susceptible bacterial fish diseases\u003c\/strong\u003e.\u003c\/p\u003e\n\n  \u003cp\u003eFish Pen attacks bacterial infections by blocking construction of the bacterial cell wall. Without a strong protective wall, susceptible bacteria rupture and die, helping stop the infection before it spreads or causes extensive tissue damage.\u003c\/p\u003e\n\n  \u003ch2\u003eWhat Does Fish Pen Treat?\u003c\/h2\u003e\n\n  \u003cp\u003eFish Pen is designed for bacterial diseases caused by organisms susceptible to penicillin. It is especially useful for infections involving the fins, tail, skin, eyes, mouth and gills.\u003c\/p\u003e\n\n  \u003cul\u003e\n    \u003cli\u003e\u003cstrong\u003eFin rot and tail rot\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003cstrong\u003eColumnaris and Flexibacter infections\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003cstrong\u003eBacterial gill disease\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003cstrong\u003eInfected eyes and bacterial popeye\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003cstrong\u003eBacterial mouth infections and mouth rot\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003cstrong\u003eOpen sores and skin ulcerations\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003cstrong\u003eInfected cuts, wounds and abrasions\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003cstrong\u003eRed lesions and inflamed tissue\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003cstrong\u003eBacterial skin and soft-tissue infections\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003cstrong\u003eSecondary bacterial infections following injury or stress\u003c\/strong\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eCommon Signs of a Bacterial Fish Infection\u003c\/h2\u003e\n\n  \u003cp\u003eBacterial infections can spread quickly and permanently damage the fish’s fins, eyes, skin and gills. Fish Pen may be appropriate when fish display symptoms consistent with an infection caused by susceptible bacteria, including:\u003c\/p\u003e\n\n  \u003cul\u003e\n    \u003cli\u003eFrayed, deteriorating or discolored fins\u003c\/li\u003e\n    \u003cli\u003eReceding tail tissue or inflamed fin edges\u003c\/li\u003e\n    \u003cli\u003eCloudy, swollen or protruding eyes\u003c\/li\u003e\n    \u003cli\u003eRedness or inflammation around the eyes\u003c\/li\u003e\n    \u003cli\u003eWhite, gray or damaged tissue around the mouth\u003c\/li\u003e\n    \u003cli\u003eOpen wounds, ulcers or crater-like sores\u003c\/li\u003e\n    \u003cli\u003eRed patches, lesions or streaks on the body\u003c\/li\u003e\n    \u003cli\u003ePale, swollen or inflamed gills\u003c\/li\u003e\n    \u003cli\u003eRapid breathing or gasping near the surface\u003c\/li\u003e\n    \u003cli\u003eLoss of appetite, weakness or unusual inactivity\u003c\/li\u003e\n    \u003cli\u003eFish hiding, isolating or remaining near the aquarium floor\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003ePowerful Penicillin Antibiotic for Aquarium Fish\u003c\/h2\u003e\n\n  \u003cp\u003e\u003cstrong\u003ePenicillin V potassium\u003c\/strong\u003e belongs to the beta-lactam class of antibiotics. It binds to essential bacterial proteins and prevents susceptible bacteria from completing the construction of their protective cell wall.\u003c\/p\u003e\n\n  \u003cp\u003eAs the damaged cell wall becomes unstable, the bacteria rupture and die. This bactericidal action makes Fish Pen a powerful treatment for susceptible bacterial infections involving the \u003cstrong\u003efins, tail, skin, eyes, mouth, gills and soft tissues\u003c\/strong\u003e.\u003c\/p\u003e\n\n  \u003cp\u003eFish Pen provides its strongest activity against susceptible gram-positive bacteria while also affecting certain gram-negative organisms.\u003c\/p\u003e\n\n  \u003ch2\u003eWhy Fish Pen Is a Powerful Fish Antibiotic\u003c\/h2\u003e\n\n  \u003cul\u003e\n    \u003cli\u003eContains 500mg of penicillin V potassium per tablet\u003c\/li\u003e\n    \u003cli\u003eProvides powerful bactericidal antibacterial action\u003c\/li\u003e\n    \u003cli\u003eDestroys susceptible bacteria by attacking the cell wall\u003c\/li\u003e\n    \u003cli\u003eStrong activity against many gram-positive bacteria\u003c\/li\u003e\n    \u003cli\u003eTreats fin rot, tail rot and bacterial fin infections\u003c\/li\u003e\n    \u003cli\u003eHelps control columnaris and Flexibacter infections\u003c\/li\u003e\n    \u003cli\u003eUseful for infected eyes and bacterial popeye\u003c\/li\u003e\n    \u003cli\u003eTreats ulcers, wounds and bacterial skin infections\u003c\/li\u003e\n    \u003cli\u003eSuitable for ornamental freshwater and saltwater fish\u003c\/li\u003e\n    \u003cli\u003eAvailable in 30-tablet and 60-tablet packages\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eAvailable Fish Pen Sizes\u003c\/h2\u003e\n\n  \u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eStrength\u003c\/th\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eQuantity\u003c\/th\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eActive Ingredient\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px;\"\u003e500mg\u003c\/td\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px;\"\u003e30 Tablets\u003c\/td\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px;\"\u003ePenicillin V Potassium\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px;\"\u003e500mg\u003c\/td\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px;\"\u003e60 Tablets\u003c\/td\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px;\"\u003ePenicillin V Potassium\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eFish Pen 500mg – 30 Tablets\u003c\/h2\u003e\n\n  \u003cp\u003e\u003cstrong\u003eFish Pen 500mg with 30 tablets\u003c\/strong\u003e provides a convenient supply of penicillin V potassium for aquarium owners requiring a powerful antibacterial fish treatment. Every tablet contains a consistent 500mg strength.\u003c\/p\u003e\n\n  \u003ch2\u003eFish Pen 500mg – 60 Tablets\u003c\/h2\u003e\n\n  \u003cp\u003e\u003cstrong\u003eFish Pen 500mg with 60 tablets\u003c\/strong\u003e provides a larger supply for additional treatment requirements, larger aquarium systems or fish keepers maintaining several freshwater or saltwater aquariums.\u003c\/p\u003e\n\n  \u003ch2\u003eFish Pen for Fin Rot and Tail Rot\u003c\/h2\u003e\n\n  \u003cp\u003eFin rot and tail rot cause progressive deterioration of the fish’s fins. The tissue may become frayed, discolored, inflamed and increasingly shorter as the bacterial infection advances.\u003c\/p\u003e\n\n  \u003cp\u003eWhen the condition is caused by bacteria susceptible to penicillin, Fish Pen destroys the bacteria responsible for the infection and helps stop further loss of healthy fin and tail tissue.\u003c\/p\u003e\n\n  \u003cp\u003eWater quality must also be corrected because ammonia, nitrite, organic waste, overcrowding and chronic stress can weaken the fish and allow fin rot to return.\u003c\/p\u003e\n\n  \u003ch2\u003eFish Pen for Columnaris and Flexibacter\u003c\/h2\u003e\n\n  \u003cp\u003e\u003cstrong\u003eColumnaris\u003c\/strong\u003e, historically associated with the name Flexibacter, is a potentially aggressive bacterial disease affecting the mouth, skin, fins and gills. Signs may include white or gray patches, cotton-like mouth damage, saddle-shaped lesions, frayed fins and respiratory distress.\u003c\/p\u003e\n\n  \u003cp\u003eFish Pen may be used when the infection is caused by a bacterial strain susceptible to penicillin. Early treatment is important because advanced columnaris can rapidly damage the skin and gill tissue.\u003c\/p\u003e\n\n  \u003ch2\u003eFish Pen for Infected Eyes and Popeye\u003c\/h2\u003e\n\n  \u003cp\u003eBacterial eye infections may cause cloudiness, swelling, inflammation and protrusion of one or both eyes. These symptoms may develop following an injury or as part of a wider systemic infection.\u003c\/p\u003e\n\n  \u003cp\u003eFish Pen attacks susceptible bacteria involved in infected eyes and bacterial popeye. Excellent water quality should be maintained throughout treatment because ammonia, physical injury and environmental stress can also contribute to eye problems.\u003c\/p\u003e\n\n  \u003ch2\u003eFish Pen for Ulcers and Infected Wounds\u003c\/h2\u003e\n\n  \u003cp\u003eOpen wounds and skin ulcers provide a direct route for harmful bacteria to invade deeper tissues. Without effective treatment, a localized wound can develop into a severe soft-tissue or systemic infection.\u003c\/p\u003e\n\n  \u003cp\u003eFish Pen provides bactericidal activity against susceptible bacteria involved in \u003cstrong\u003einfected wounds, skin ulcers, red sores, lesions and damaged tissue\u003c\/strong\u003e.\u003c\/p\u003e\n\n  \u003ch2\u003eFish Pen for Bacterial Gill Disease\u003c\/h2\u003e\n\n  \u003cp\u003eBacterial gill disease damages the delicate respiratory tissue used by fish to absorb oxygen. Affected fish may breathe rapidly, remain near the surface, rub against aquarium objects or develop pale, swollen and inflamed gills.\u003c\/p\u003e\n\n  \u003cp\u003eFish Pen may treat gill disease caused by bacteria susceptible to penicillin. Strong aeration and excellent water quality are essential while treating fish experiencing respiratory distress.\u003c\/p\u003e\n\n  \u003ch2\u003eFreshwater and Saltwater Fish Antibiotic\u003c\/h2\u003e\n\n  \u003cp\u003eFish Pen may be incorporated into treatment programs for susceptible bacterial infections affecting ornamental fish maintained in \u003cstrong\u003efreshwater and saltwater aquariums\u003c\/strong\u003e. This includes tropical fish, bettas, goldfish, koi, cichlids and marine ornamental species.\u003c\/p\u003e\n\n  \u003cp\u003eWhenever practical, move infected fish to a dedicated hospital or quarantine aquarium. A separate treatment environment makes it easier to monitor the fish, control medication use and protect healthy aquarium inhabitants.\u003c\/p\u003e\n\n  \u003ch2\u003eImportant Treatment Information\u003c\/h2\u003e\n\n  \u003cp\u003eConfirm that the condition is bacterial before using Fish Pen. Penicillin treats susceptible bacterial infections; it does not eliminate parasites, viruses or true fungal diseases.\u003c\/p\u003e\n\n  \u003cp\u003eFollow the directions supplied with the product. Remove activated carbon, chemical filtration and UV sterilization when directed because these systems may reduce the available medication. Maintain strong aeration and monitor ammonia, nitrite, pH and fish behavior throughout treatment.\u003c\/p\u003e\n\n  \u003cp\u003eComplete the recommended treatment course even when symptoms begin improving. Ending antibiotic treatment too early may allow surviving bacteria to multiply, cause the infection to return and contribute to antibiotic resistance.\u003c\/p\u003e\n\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProduct name:\u003c\/strong\u003e Fish Pen\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAlso searched as:\u003c\/strong\u003e Fish Pen Forte\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eActive ingredient:\u003c\/strong\u003e Penicillin V potassium\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMedication class:\u003c\/strong\u003e Beta-lactam penicillin antibiotic\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProduct type:\u003c\/strong\u003e Bactericidal fish antibiotic\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStrength:\u003c\/strong\u003e 500mg per tablet\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAvailable quantities:\u003c\/strong\u003e 30 and 60 tablets\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDosage form:\u003c\/strong\u003e Tablets\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTarget:\u003c\/strong\u003e Susceptible bacterial infections\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAquarium type:\u003c\/strong\u003e Freshwater and saltwater\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIntended use:\u003c\/strong\u003e Ornamental aquarium fish\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eStorage\u003c\/h2\u003e\n\n  \u003cp\u003eStore Fish Pen in its original, tightly closed container in a cool, dry location. Protect the tablets from moisture, excessive heat and direct sunlight. Keep out of reach of children and animals.\u003c\/p\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003ch3\u003eIs Fish Pen an antibiotic?\u003c\/h3\u003e\n  \u003cp\u003eYes. Fish Pen contains penicillin V potassium, a bactericidal beta-lactam antibiotic used against susceptible bacterial infections in ornamental aquarium fish.\u003c\/p\u003e\n\n  \u003ch3\u003eWhat infections does Fish Pen treat?\u003c\/h3\u003e\n  \u003cp\u003eFish Pen is commonly used for fin rot, tail rot, columnaris, Flexibacter infections, bacterial gill disease, infected eyes, bacterial popeye, ulcers, wounds and other infections caused by bacteria susceptible to penicillin.\u003c\/p\u003e\n\n  \u003ch3\u003eWhat is the active ingredient in Fish Pen?\u003c\/h3\u003e\n  \u003cp\u003eEach Fish Pen tablet contains 500mg of penicillin V potassium.\u003c\/p\u003e\n\n  \u003ch3\u003eHow does Fish Pen work?\u003c\/h3\u003e\n  \u003cp\u003ePenicillin blocks construction of the bacterial cell wall. Susceptible bacteria become structurally unstable, rupture and die.\u003c\/p\u003e\n\n  \u003ch3\u003eCan Fish Pen treat fin rot and tail rot?\u003c\/h3\u003e\n  \u003cp\u003eFish Pen may treat fin and tail rot caused by bacteria susceptible to penicillin. Water quality, injuries and environmental stress should also be corrected.\u003c\/p\u003e\n\n  \u003ch3\u003eCan Fish Pen treat columnaris?\u003c\/h3\u003e\n  \u003cp\u003eFish Pen may be used when columnaris is caused by a susceptible bacterial strain. Columnaris can progress rapidly, making early identification and treatment important.\u003c\/p\u003e\n\n  \u003ch3\u003eCan Fish Pen treat popeye?\u003c\/h3\u003e\n  \u003cp\u003eFish Pen may help when popeye is associated with a susceptible bacterial infection. Popeye caused solely by physical injury or poor water quality requires correction of the underlying cause.\u003c\/p\u003e\n\n  \u003ch3\u003eCan Fish Pen be used for freshwater and saltwater fish?\u003c\/h3\u003e\n  \u003cp\u003eFish Pen may be used in appropriate treatment programs for ornamental freshwater and saltwater fish according to the supplied directions.\u003c\/p\u003e\n\n  \u003ch3\u003eDoes Fish Pen treat parasites or fungal infections?\u003c\/h3\u003e\n  \u003cp\u003eNo. Penicillin is an antibacterial medication. It does not eliminate parasites, viruses or true fungal infections.\u003c\/p\u003e\n\n  \u003ch3\u003eWhat sizes are available?\u003c\/h3\u003e\n  \u003cp\u003eFish Pen is available as 500mg tablets with either 30 or 60 tablets per package.\u003c\/p\u003e\n\n  \u003cp\u003e\u003cstrong\u003eFor ornamental fish use only. Not for human use or for fish intended for human consumption.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"FIXMOX","offers":[{"title":"500-mg (30 Tablets)","offer_id":57343397331209,"sku":null,"price":34.99,"currency_code":"USD","in_stock":true},{"title":"500-mg (60 Tablets)","offer_id":57343397363977,"sku":null,"price":89.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0883\/0874\/4457\/files\/Pen50030_f4ebcf9e-0faa-460f-8906-cbab556ec2c6.png?v=1789738031","url":"https:\/\/fixmox.com\/products\/fish-pen-penicillin-500mg-fish-antibiotic-30-60-tablets","provider":"MOX","version":"1.0","type":"link"}