Question 1

What is Formalin (37% formaldehyde solution) used for?

Accepted Answer

Formalin (37% formaldehyde solution) is indicated for: Ichthyophthirius multifiliis (freshwater ich / white spot).

Question 2

What routes can Formalin (37% formaldehyde solution) be administered by?

Accepted Answer

Available routes: Immersion (bath).

Question 3

Which species have cited Formalin (37% formaldehyde solution) dosing data?

Accepted Answer

Formalin (37% formaldehyde solution) dosing in the ExoticRx formulary covers 2 species: Goldfish, Koi.

Question 4

Is Formalin (37% formaldehyde solution) a controlled substance?

Accepted Answer

Formalin (37% formaldehyde solution) is not federally scheduled in the US. Controlled-drug status differs by country — verify your local rules.

Question 5

What are the warnings or contraindications for Formalin (37% formaldehyde solution)?

Accepted Answer

IMMERSION USE ONLY in fish - formalin is added to the water, never injected or given orally. It strips dissolved oxygen from the water, so supplemental aeration is mandatory and dissolved oxygen and biological filtration must be monitored throughout treatment. Toxicity rises as temperature rises and as oxygen falls. Some fish and invertebrate species and some life stages are formalin-sensitive; scaleless fish, fry and heavily parasitised fish are least tolerant. High-dose protocols (250 mg/L) are documented as capable of causing morbidity and mortality. Formalin is a human carcinogen - suitable PPE is required when handling it. Discard any formalin containing visible white paraformaldehyde precipitate: it is far more toxic to fish than the clear solution.

Question 6

What are the side effects of Formalin (37% formaldehyde solution)?

Accepted Answer

Reported side effects, adverse reactions, and contraindications for Formalin (37% formaldehyde solution): IMMERSION USE ONLY in fish - formalin is added to the water, never injected or given orally. It strips dissolved oxygen from the water, so supplemental aeration is mandatory and dissolved oxygen and biological filtration must be monitored throughout treatment. Toxicity rises as temperature rises and as oxygen falls. Some fish and invertebrate species and some life stages are formalin-sensitive; scaleless fish, fry and heavily parasitised fish are least tolerant. High-dose protocols (250 mg/L) are documented as capable of causing morbidity and mortality. Formalin is a human carcinogen - suitable PPE is required when handling it. Discard any formalin containing visible white paraformaldehyde precipitate: it is far more toxic to fish than the clear solution.

Formalin (37% formaldehyde solution)

Drug Class

Routes

Indications

Side effects & warnings

Species with Formalin (37% formaldehyde solution) dosing data (6 dose rules)

Evidence levels across 6 dose rules

Backed by 3 published sources

Upgrade for Full Details