Here's a list of some of the common treatments for diseases in the US. This may not be all of them, so feel free to PM me to add more onto this. Just include the name, whether it's parasitic, fungal, or bacterial, and a brief description.

I cannot personally guarantee any of these medications will treat your fish, or work for you. It's just a list so you can see your options. Descriptions were taken from manufacturers, so the authenticity is not guaranteed. Please read the information on the medicine you try for dosage and warnings.


Parasitic

Super Ich Cure by Aquarium Pharmaceuticals
Treats Ichthyophthirius or white spot. For Freshwater Aquariums Only.


Fish Zole by Thomas Labratories
Fish-strength metronidazole will treat hole-in-head disease along with other parasitic problems.


PraziPro by Aquarium Solutions
PraizoPro is a quick, safe way to rid your tank and fish of flukes, tapeworms, flatworms and many other internal and external parasites.


Ich-X by Aquarium Solutions
Utilizing a safer, less harsh form of malachite green, Ich-X takes care of freshwater and saltwater Ich, velvet, fungus, and other Protozoan-caused diseases quickly and effectively. This treatment can be used with scaleless and pond fish.


Kick Ich by Ruby Reef
Water treatment for the control of Ich in marine and freshwater aquariums. Scientifically formulated to eliminate Ich in the free swimming infectious stage of the Ich life cycle while being safe for freshwater and marine aquariums.


Safe Rally by Ruby Reef
Reef Safe Rally is a copper free water treatment for freshwater and marine fish suffering from marine velvet, dinoflagellates, flukes and bacterial infections.


Ultra Cure PX by Gel-tek
Takes care of intestinal worms, flagellates and a number of other unwelcome internal guests. Safe for both freshwater and saltwater.


Clout by Aquarium Products
Effective medication for the treatment or parasitic and protozoan infestations of freshwater and saltwater fish. Treats: Ich, Hydra, Leeches, Planaria, Epistylis, Trichodina, Tetrahymena, Body Fungus, Argulus(Louse), Flukes, and Anchor Worms.


Fluke Tabs by Aquarium Products
Effective medication for the treatment of resistant strains of parasitic infestations in of coldwater, freshwater, and marine fish. Treats: Tapeworms, Parasitic Copepods, Anchor Worms, Body Flukes, Gill Flukes, Fish Louse, Capillaria, and other Trematodes. Do not use with Invertebrates.


Anti-Fluke by Aquarium Products
Like the tabs above, only a liquid. Treats Gill Flukes, Body Flukes, Anchor Worms, and Fish Lice. Do not use with Invertebrates.


Life Bearer by AP Pro
Eliminates flukes and fish lice. Stops shaking and rubbing of fish due to parasites in 48 hours or less. For use in fresh or saltwater. Do not use with Invertebrates.


Quick Cure by AP Pro
Quick Cure is a strong, yet safe formula for the cure of Ich and lymphocystis. Safe for fresh or saltwater. Not recommended with Invertebrates.


Aquari-Sol by AP Pro
Effective medication for Ich, clamped fins, body fungus, and velvet in freshwater fish.


Super Goldfish Disease Eliminator by AQ Products
The Disease Eliminator will bring quick relief to your sick goldfish if it has the following symptoms: gasping for air; flicking against gravel, decor, etc; fins look "eaten away" or have red streaks; fish has white "sugar like" granules on fins or body; sluggish or not eating.


Aqua-Sol by Aquarium Products
A gentle yet effective treatment for Ich and other parasitic protozoan infections. For Freshwater use only.


Cure-Ick by Aquarium Products
Fast relief for Ich and other parasitic protozoan infections. Safe for fresh and saltwater. Not for use with Invertebrates or Live rock.


ParaGuard by Seachem
Takes care of ich, while keeping your fish safe. Also treats most parasitic infections.


PolyGuard by Seachem
Treats most parasitic infections. Not for use with Plants.


Sulfathiazole by Seachem
Effectively treats parasitic infections while remaining safe for saltwater and freshwater fish. Use caution when treating with Invertebrates.


Metronidazole by Seachem
Treats external "bugs" such as Ich and Hexamita, and is safe for fish sensitive to copper.


Cupramine by Seachem
Superior to copper sulfates, and is non-acidic. This is a buffered active copper, not a chelate or citrate. Do not use with Invertebrates.


Ick Guard by Jungle
A water conditioner for removing Ich or whitespot from the aquarium. For freshwater use only.



Ick Guard II by Jungle
Liquid medication for the treatment of Ich or whitespot on small, weak, or scaleless fish such as Loaches, Catfish, etc. For freshwater use only.


Parasite Guard by Jungle
Controls external parasites such as lice, Body Flukes, Gill Flukes, and Anchor Worms. For freshwater use only.


Hole-in-Head Guard by Jungle
Treats Hole-in-Head. For freshwater use only.


Ick Clear by Jungle
Clears up Ich problems in the aquarium quickly. Protects against secondary infections.


Parasite Clear by Jungle
Removes internal and external parasites from tropical fish including protozoa’s, flukes, lice, anchor worms, and flagellates. Protects against secondary infections.


Molly Bright by Jungle
Helps prevent shimmies in Livebearers, especially Mollies.


CopperSafe by Mardel
Safe, stable copper for the treatment of Ich, Trichodina, Gyrodactylus, Flukes, Anchor Worm and other freshwater parasites.


Maracide by Mardel
Highly effective treatment for Ich, Trichodina, Chilodonella and related parasitic infections. For freshwater use only.


Malachite Green by Kordon
Controls various external parasites of freshwater and marine fish. Controls or prevents such common protozoan parasites as Ich, costia, chilodonella, cryptocaryon and trichodina.


Rid-Ich by Kordon
A completely safe effective treatment in freshwater and saltwater on a wide range of protozoan, crustacean and other invertebrate parasites of fish.


Permoxyn-Potassium Permanganate by Kordon
Useful for disease treatment of flukes, lice, and anchor worms. Can be used to de-activate treatements such as malachite green and formalin. For freshwater only.


Medi-Gold for Goldfish
A medicated food just for Goldfish. Medi-Gold is a small slow sinking pellet, with ingredients your fish love, like, krill, shrimp, and much more, that encourages your sick fish to eat.



Bacterial

MelaFix by API
All-natural botanical remedy safe for plants, invertebrates, and all fish. Repairs damaged fins, open wounds, and tail rot, as well as pop-eye, mouth fungus, and many other bacterial infections. For fresh and saltwater.


PimaFix by API
For all external bacterial infections. Can be used with MelaFix, safe for fresh and saltwater.


Fish-mox by Thomas Labratories
Amoxicillin just for fish, especially effective against bacterial gill diseases.


Fish-cillin by Thomas Labratories
The antibiotic Ampicillin in specialized fish strength takes care of fin and tail rot.


Fish-pen by Thomas Labratories
Powerful Penicillin just for fish will treat any manner of bacterial diseases.


Fish-flex by Thomas Labratories
Contains the antibiotic Cephalexin, a powerful medication for general bacterial infections.


Fish-cycline by Thomas Labratories
The common antibiotic Tetracycline is effective against gill diseases and chondroccus.


Furan-2 by Aquarium Pharmaceuticals
Treats dropsy, Furunculosis (Aeromonas), Gill Disease, Fin and Tail Rot, and Black Molly disease. For fresh and saltwater fish.


Triple Sulfa by Aquarium Pharmaceuticals
Medication for the treatment of Cotton Mouth, Fin and Tail Rot, Furunculosis, Body Slime, and Eye Cloud. For fresh and saltwater fish.


T.C. Capsules by Aquarium Pharmaceuticals
Treats common bacterial diseases such as Tail Rot, Mouth Fungus and Gill Disease. For fresh and saltwater fish.


Bio-Bandage by Pond Solutions
Treats wounds and bacterial lesions on the fish. Treats wounds, lesions, cysts, fin rot and any bacterial infection susceptible to Neomycin, the active ingredient. Must be applied directly on the fish.


Safe Rally by Ruby Reef
A reef-safe copper-free treatment for tropical and marine fish suffering from bacterial infections.


Ultra-Cure BX by Gel-tek
Treats both internal and external bacterial infections such as septicemia, wasting disease, open sores, and ulcers. Also prevents secondary infection outbreaks.


Furanase by Aquarium Products
Treats: Columnaris, Black Molly Disease, Cotton or Mouth Fungus, and Tail Rot, as well as other gram-negative and gram-positive bacteria.


ParaGuard by Seachem
Treats numerous bacterial infections.


KanaPlex by Seachem
Treats bacterial fish diseases such as dropsy, pop-eye, fin/tail rot and septicemia. Safe for fresh and saltwater fish.


NeoPlex by Seachem
Broad spectrum antibiotic that will treat any kind of internal or external bacterial infection. Safe for fresh and saltwater fish. Relatively safe with live plants and invertebrates, though extra care should be taken with sensitive species.


Polyguard by Seachem
Treats bacterial infections. Should not be used with Live Plants.


Sulfathiazole by Seachem
Treats bacterial infections, along with parasitic and fungal. Safe for freshwater and saltwater fish, caution should be used if treating with Invertebrates.


Metronidazole by Seachem
Treats bacterial infections. Safe alternative for fish sensitive to copper.


Fungus Clear by Jungle
Treats bacterial diseases in your freshwater fish. Also protects against secondary infection.


Fungus Eliminator by Jungle
Treats serious fungal and bacterial diseases such as; Cotton Fungus, Grey Skin, Fish Bloat, Fin and Mouth Rot, White Film on eyes, Red streaks on fins, and Swim Bladder Disease. For freshwater use only.


Binox Powder by Jungle
Extra strength bacterial remedy. For freshwater only.


Hole-In-Head Guard by Jungle
Treats Hole-in-Head. For freshwater use only.


Maracyn by Mardel
Gram-positive antibiotic for the treatment of internal and external bacterial diseases. Safe for fresh and saltwater, however they are packaged separately for each. Do not use with Invertebrates.


Maracyn-Two by Mardel
Gram-negative antibiotic for the treatment of internal and external bacterial diseases. Safe for fresh and saltwater, though they are sold separately. Do not use with Invertebrates.


MarOxy by Mardel
Colorless treatment for bacterial infections. Comes separately for saltwater, do not use with Invertebrates in saltwater.


Tetracycline by Mardel
Broad-spectrum Gram-negative antibiotic tablet for treating common bacterial diseases.


Bio-Spheres Anti Bacterial by Mardel
Antibacterial formula that kills bacteria that cause mouth fungus, fin and tail rot, pop-eye, dropsy, and ulcers. Prevents re-infection during treatment.




Fungal

PimaFix by API
All-natural remedy for fungal infections. Can be used with MelaFix. Safe for fresh and saltwater fish.


Fish-mycin by Thomas Labratories
Erythromycin treats gill diseases, rot, and molly disease.


Fish-fungus by Thomas Labratories
The anti-fungal ingredient Ketocanazole is a powerful treatment for all types of fish fungal infections.


E.M. Tablets by Jungle
Medication for the treatment of Body Slime, Mouth Fungus, Eye Cloud, Furunculosis and Hemorrhagic Septicemia. For fresh and saltwater.


FungusCure by Jungle
Treats Mouth Fungus, Eye Fungus, and Fin and Tail Rot. Kills cotton-like fungus patches and white body and eye slime fungus. For freshwater only.


Ich-X by Aquarium Solutions
Utilizing a safer, less harsh form of malachite green, it treats fungus in saltwater and freshwater fish. Can be used with scaleless fish and pond fish.


Aquari-Sol by AP Pro
Medication for body fungus. Freshwater use only.


KanaPlex by Seachem
A blended kanamycin medication that treats fungal infections such as pop-eye, dropsy, and fin/tail rot. Safe for freshwater and saltwater fish.


PolyGuard by Seachem
Safely treats bacterial, fungal, and parasitic infections. Do not use with Live Plants.


Sulfathiazole by Seachem
Treats fungal infections in saltwater and freshwater fish. Use caution when treating a tank with Invertebrates.


Metronidazole by Seachem
Treats bacterial infections. Safe alternative for fish that are sensitive to copper.


Fungus Clear by Jungle
Cures fungal diseases in your freshwater fish. Protects against secondary infections.


Binox Powder by Jungle
Extra strength fungal remedy. For freshwater only.


Hole-In-Head Guard by Jungle
Treats Hole-In-Head. For freshwater use only.

Maracyn by Mardel
Gram-positive antibiotic for the treatment of common fungal diseases. Safe for fresh and saltwater, however they are packaged separately. Do not use with Invertebrates.

Maracyn-Two by Mardel
Gram-negative antibiotic for the treatment of fungal diseases. Safe for fresh and saltwater, though they are sold separately. Do not use with Invertebrates.

MarOxy by Mardel
Colorless medication for the treatment of true fungus diseases. Also protects eggs from fungal attack. Comes in a saltwater form too, however that one should not be used with Invertebrates.


Formalin-3 by Kordon
A convenient, pre-diluted form of formalin that is scientifically recognized as an effective medication for the treatment and control of the diseases caused by fungi, protozoa’s, and monogenetic trematodes of fresh and marine fish.


Malachite Green by Kordon
Effective against common external fungal infections of fish eggs.


Methylene Blue by Kordon
Effective agent against superficial fungal infection of fish, safe for use with fish eggs and fry. May be used as an alternative to malachite green for the treatment of fungus. Safe for freshwater and saltwater fish, but toxic to plants and may harm the biological filtration.



Once again, I cannot guarantee the authenticity of these statements.