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Several drugs and compounds may be radiopaque on an abdominal radiograph. This may be helpful in an overdose to determine ingestion or amount ingested. Attached is a pic a patient that ingested potassium sustained release tables.
The mneumonic CHIPES will help you remember which are:
C - Calcium Carbonate, chloral hydrate
H - Heavy metal - like Mercury, lead
I - Iron and Iodine
P - Phenothiazines (compound that has S(C6H4)2NH in it), drugs that include: antipsychotics like chlorpromazine (thorazine) and antiemetics like prochlorperazine (compazine)
E - Enteric coated pills
S - Solvents [halogenated ones like chloroform] and Sustained Release preparations [Lithobid and K-Dur]