Some chemicals and drugs may be poorly adsorbed onto activated charcoal. The administration of activated charcoal has limited benefit in intoxications caused by these agents.
Alcohols:
(1) ethanol
(2) ethylene glycol
(3) isopropyl alcohol
(4) methanol
Alkali metals (Group Ia chemicals)
(1) lithium
(2) potassium
(3) sodium
Metals:
(1) iron
(2) lead
Halogens (Group VIIa chemicals):
(1) bromide
(2) iodine
Corrosives:
(1) strong acids
(2) strong alkalis
Other compounds:
(1) acetone
(2) borates
(3) cyanide
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