Assuming they would react to drugs the same way a human would a guide to the common edible and medicinal sea plants could help. Here's a link https://spccfpstore1.blob.core.windows.net/digitallibrary-docs/files/11/11082b5275c07c2294d2a6c92c2c9a60.pdf?sv=2015-04-05&sr=b&sig=gnbRXwiJGeZksIcyvbqwLx1kOY%2Fh5Iub6yqSTP%2BqrT8%3D&st=2016-02-05T19:24:25Z&se=2016-02-06T19:29:25Z&sp=r&rsct=application%2Fpdf&rscd=inline%3B%20filename%3D%22Novaczek_01_MedicinalSeaPlants.pdf%22
And what about NaCl liquid?It is like sea water solution used for washing out the wound and better healing (NaCl) = 0,9%)
For medical purposes, saline is often used to flush wounds and skin abrasions. Normal saline will not burn or sting when applied- Saline is also often used for nasal washes to relieve some of the symptoms of the common cold.
Here's a link for some sea salt remedies http://www.earthclinic.com/remedies/sea_salt.html