No.

Diphenhydramine sample

Taken amount, mg/ml

Direct potentiometry

Known addition method

Percentage found, %

STD^*

Percentage found, %

STD^*

1

Exylin Pediatric Syrup (Diphenhydramine Hydrochloride, Menthol), Spimaco Saudi Arabia

7

98.2

0.17

95.71

0.29

2

Amydramine Expectorant Syrup Sugar Free, (Diphenhydramine Hydrochloride, Ammonium, Sodium Citrate, Menthol), Gulf Pharm. Ind. (Julphar, United Arab Emirates

15

98.5

0.25

98.5

0.22

3

Koffex Syrup For Adult, (Diphenhydramine Hydrochloride, Ammonium, Sodium Citrate) Xellia Pharm. Aps, Denmark

10

97.8

0.25

98

0.42

4

Ezipect Syrup, (Diphenhydramine Hydrochloride), Tabuk Pharmaceutical Manufacturing Co., Saudi Arabia

2.5

98

0.13

95

0.17