DRUG DOSAGE FORMS & DELIVERY SYSTEMS


Gels

Are semisolid systems consisting of either suspensions made up of small inorganic particles or large organic molecules in an liquid vehicle rendered jelly like by the addition of a GELLING AGENT.

Sometimes called JELLIES.

Preparation of Gels
  1. By freshly precipitating the disperse phase upon reaching an inorganic agents, a gelatinous precipitate results

    Example: Preparation of AI(OH)3 gel is by reacting AI(CI)3 + Na2CO3 arrow_forward NaHCO3
  2. By direct hydrating the inorganic material in water.

    AI2O3 + H2O arrow_forward AI(OH)3

    Examples: Aluminum Hydroxide Gel; Alugel; Amphogel; Ce-lu-gel; Cremalin; Hydroxal; Vanogel; Aluminum Phosphate Gel (Phosphagel) - Antacid