The concept of mouth dissolving drug delivery system emerged from the desire to provide more convenient means of taking medication for the patient. It is difficult for many patients to swallow tablets and hard gelatin capsules. Due to decline in the swallowing ability with age so many elderly patients complain that it is very difficult to take medication in the form of tablets. Hence, they do not comply with prescription, which results in high incidence of non-compliance and ineffective therapy. In some cases such as motion sickness, sudden episodes of allergic attacks or coughing and unavailability of water, swallowing of conventional tablets may be difficult. Such problems can be resolved by means of Mouth dissolving Tablet (MDT). In such cases, bioavailability of drug is significantly greater than those observed from conventional tablet dosage form.