Ethacridine lactate (ethacridine monolactate monohydrate, acrinol, trade name Rivanol) is an aromatic organic compound based on acridine.

It forms orange-yellow crystals with a melting point of 226 °C and it has a stinging smell.

It is effective against mostly Gram-positive bacteria, such as Streptococci and Staphylococci, but ineffective against Gram-negative bacteria such as Pseudomonas aeruginosa.

Up to 150 ml of a 0.1% solution is instilled extra-amniotically using a foley catheter.

[3] Ethacridine as an abortifacient is found to be safer and better tolerated than 20% hypertonic saline.