{"product_id":"fish-penicillin-500mg-100-tablets-fish-antibiotics","title":"Fish Penicillin 500mg 100 Tablets Fish Antibiotics","description":"\u003ch2\u003eFish Pen 500 (Penicillin) Fish Antibiotics 500mg Tablets – 100 Count\u003c\/h2\u003e\n\n\u003cp\u003e\nFish Pen 500 is a penicillin-based fish antibiotic formulated to support the treatment of bacterial infections in aquarium fish. This 100 count bottle provides a reliable solution for managing gram-positive bacterial conditions commonly found in freshwater and saltwater environments.\n\u003c\/p\u003e\n\n\u003cp\u003e\nPenicillin is one of the most established antibiotics used in fish care, helping to control infections at early stages and prevent the spread of disease within the aquarium.\n\u003c\/p\u003e\n\n\u003ch3\u003eCommon Uses in Aquarium Fish\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEarly-stage bacterial infections\u003c\/li\u003e\n\u003cli\u003eFin and tail rot (early phase)\u003c\/li\u003e\n\u003cli\u003eSkin lesions and ulcers\u003c\/li\u003e\n\u003cli\u003eGill infections\u003c\/li\u003e\n\u003cli\u003eGram-positive bacterial infections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDosage \u0026amp; Directions\u003c\/h3\u003e\n\u003cp\u003e\nUse one tablet (500mg) per 10–20 gallons of aquarium water. Crush and dissolve the tablet before adding to the tank. Repeat treatment every 24 hours for 5–7 days depending on severity.\n\u003c\/p\u003e\n\n\u003ch3\u003eImportant Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFor aquarium and ornamental fish use only\u003c\/li\u003e\n\u003cli\u003eNot for fish intended for human consumption\u003c\/li\u003e\n\u003cli\u003eBest used in early infection stages\u003c\/li\u003e\n\u003cli\u003eMonitor fish behavior during treatment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eStorage Instructions\u003c\/h3\u003e\n\u003cp\u003e\nStore in a cool, dry place away from moisture and direct sunlight. Keep container tightly sealed.\n\u003c\/p\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat does Fish Pen 500 treat?\u003c\/strong\u003e\u003cbr\u003e\nIt is used for gram-positive bacterial infections, including early fin rot, skin infections, and gill issues.\n\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen should penicillin be used?\u003c\/strong\u003e\u003cbr\u003e\nIt is most effective during early stages of infection before conditions become severe.\n\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan it be used in all aquariums?\u003c\/strong\u003e\u003cbr\u003e\nYes, it is suitable for freshwater and saltwater aquariums when used as directed.\n\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow is it administered?\u003c\/strong\u003e\u003cbr\u003e\nCrush and dissolve the tablet in aquarium water for treatment.\n\u003c\/p\u003e","brand":"Fish Antibiotic","offers":[{"title":"Default Title","offer_id":47525473091747,"sku":null,"price":89.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/4928\/0419\/files\/ChatGPTImage6dec.2025_19_50_11.png?v=1775133151","url":"https:\/\/fishantibiotic.com\/products\/fish-penicillin-500mg-100-tablets-fish-antibiotics","provider":"Fish Antibiotic","version":"1.0","type":"link"}