Combining Forms
Suffixes
Prefixes
Schedule for Controlled Substances
Prescription Reading
100

Meaning of combining form aer/o

air
100
Meaning of -al

Pertaining to

100

Meaning of anti-

Against

100

Meaning of Schedule I

Drugs with the highest potential for addiction and abuse. 

100

Way you see milligram on the bottle

mg

200

Meaning of combining form derm/o

Skin

200

Meaning of -ology

Study of 

200

Meaning of in-

Inward

200

Meaning of Schedule II

Drugs with the highest potential for addiction and abuse accepted for medical use in the United States.

200

Way you see bedtime on the bottle

hs

300

Meaning of combining form enter/o

Intestine

300
Meaning of -ist 

Specialist

300
Meaning of tans-

Through

300

Meaning of Schedule III

Drugs with a moderate to low potential for addiction and abuse. 

300

Way you see every on the bottle

q

400
Meaning of combining form or/o

Mouth

400

Meaning of -genic

Produced by
400

Meaning of sub-

Below or under

400

Meaning of Schedule IV

Drugs with a lower potential for addiction and abuse then Schedule III drugs. 

400

Way you see say on the bottle

Sig

500

Meaning of combining form lingu/o

tongue

500

Meaning of -phylaxis

Protection

500

Meaning of pro-

Before

500

Meaning of Schedule V

Drugs with a low potential for addiction and abuse. 

500

Way you see mouth on the bottle

po