Table 2.

Doxycycline eye drop formulation.

Substance	Role	Percentage
Doxycycline hyclate	Effective material	2.3008 ${ }^{*}$
HPMC	Covering polymer	0.15
NaCl	Isotonic factor	0.112
KCl	Isotonic factor	0.093
Sodium tetraborate	Buffer	0.048
Boric acid	Acidic agent	0.048
Water	Diluent	Up to 100 ml
HPMC, hydroxypropyl methylcellulose; NaCl, Sodium chloride; KCl, Potassium chloride ${ }^{*}$ 1.154 gram of doxycycline hyclate is equivalent to 1 gram of doxycycline