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hyperosmotic laxatives are glycerin and lactulose (Chronulac, Duphalac), both of which act by holding water within the intestine.
Saltwater fish are hypoosmotic.
Hyperosmotic
No. Hypertonic can be seen as hypo-osmotic and same for hypotonic and hyper-osmotic
draining of csf, hyperosmotic agent like mannitol, or diureticcraniectomy