S. No.

NAME OF THE DRUG

IUPAC NAME

MOLECULAR WEIGHT

EVENT

Peak detected in MS (m/z ratio)

1

METHADONE

6-Dimethylamino-4,4-diphenyl-3-heptanone

309.4

1

310

2

PAPAVERINE

1-[(3,4-Dimethoxyphenyl)methyl]-6,7-dimethoxyisouinoline

339.4

1

340

3

COCAINE

Methyl-[1R-exo,exo)]-3-(benzoyloxy)-8-methyl-8- azabicyclo[2.2.1]-octane-2-carboxylate

303.4

1

326*, 304**

4

KETAMINE

2-(2-chlorophenyl)-2-(methylamino)cyclohexanone

237.7

1

238

5

PHENOBARBITAL

5-Ethyl-5-phenyl-2,4,6(1H,3H,5H)-pyirimidinetrione

232.2

2

231

6

CAFFEINE

3,7-Didehydro-1,3,7-trimethyl-1H-purine-2,6-dione

194.2

2

219*, 193**

7

CODEINE

(5α,6α)-7,8-Didehydro-4,5-epoxy-3-methoxy-17-methylmorphinan-6-ol monohydrate

294.4

1

322*, 293**

8

ACETAMINOPHEN

N-(4-Hydroxyphenyl)acetamide

151.2

2

182*, 150**

9

DIAZEPAM

7-Chloro-1,3-dihydro-1-methyl-5-phenyl-2H-1,4-benzodiazepin-2-one

284.7

1

339*, 285**

10

THEBAINE

(5α)-6,7,8,14-Tetradehydro-4,5-epoxy-3,6dimethoxy-17-methylmorphina

311.4

1

312

11

HEROIN

(5α,6α)-7,8-Didehydro-4,5-epoxy-17-methylmorphinan-3,6-dioldiacetate

369.4

1

411*, 369**

12

METHAMPHETAMINE

(αS)-N,α-Dimethylbenzeneethanamine

149.2

2

149

13

CARBAMAZEPINE

5H-Dibenz[b,f]azepine-5-carboxamide

236.3

2

291*237**

14

NARCOTINE

(3S)-6,7-Dimethoxy-3-[(5R)-5,6,7,8-tetrahydro-4-methoxy-6-methyl-1,3-dioxolo[4,5-g]isoquinoline-5-yl]-1(3H)-isoenzofuranone

413.4

1

477*, 414**

15

MORPHINE

(5α,6α)-7,8-Didehydro-4,5-epoxy-3-methoxy-17-methylmorphinan-6-ol monohydrate

285.3

2

316*, 284**

16

EPHEDRINE

(αR)-α[(1S)-1-(Methylamino)ethyl]benzenemethanol hemihydrate

165.2

1

166