Advantages • A relatively rapid onset of action can be achieved compared to the oral route, and the formulation can be removed if therapy is required to be discontinued. • Liver is bypassed and also drug is protected from degradation due to pH and digestive enzymes of the middle gastrointestinal tract • Improved patient compliance due to the elimination of associated pain with injections; administration of drugs in unconscious or incapacitated patients; convenience of administration as compared to injections or oral medications. • Low dosage gives high efficacy as hepatic first pass metabolism is avoided & reduces side effects. • The large contact surface of the oral cavity contributes to rapid and extensive drug absorption. • Due to rapidity in action these sublingual dosage forms are widely used in emergency conditions e.g. asthma . (Fusari,2005) • Rapid absorption and higher blood levels due to high vascularization of the region and therefore particularly useful for administration of anti-angina drugs. • They also present the advantage of providing fast dissolution or disintegration in the oral cavity, without the need for water or chewing . Disadvantages • Since sublingual administration of drugs interferes with eating, drinking , and talking , this route is generally considered unsuitable for prolonged administration . (Pawar et al, 2018) • Although this site is not well suited to sustained‐delivery systems. • Sublingual medication cannotbe used when a patient is Un-cooperative or unconscious. • The patient should not smoke while taking sublingual medication, because smoking causes vasoconstriction of the blood vessels. This will decrease the absorption of the medication. Market Products Saphris used for acute mania & schizophrenia Used for management of breakthrough pain adult cancer patient International National Supplement for improve health Acute relief of angina (Shim et al., 2013) Important for normal blood conclusion Overall, sublingual have a lot of advantages as it is very rapid and potent, the disadvantages is that it may interferes with food and drinking, not used with unconscious patient. There are many API of the sublingual tablets such as Buprenorphine HCL, Isosorbide dinitrate , and Hyoscyamine sulphate , etc . there are many international and national drugs used as sublingual such as saphris , abstral , isodril and nervidox , etc . References - Shim, B., Choi, Y., Cheon , I. and Song, M. (2013). Sublingual Delivery of Vaccines. Immune Network, 13(3), p.81. - Pawar, P., Ghorpade , H. and Kokane , B. (2018). Sublingual route for systemic drug delivery. Journal of Drug Delivery and Therapeutics, 8(6-s), pp.340-343 . - Fusari , S.A., 1973. Nitroglycerin sublingual tablets: sublingual over oral. Journal of pharmaceutical sciences , 62 (12), pp.2012 - Lowey , H., 1999. Timed release sublingual medications . U.S. Patent 3,428,728 . Pather, S.I., Khankari , R., Robinson, and Hontz , J., Cima Labs Inc , 2001. Sublingual buccal tablets . U.S. Patent 6,200,604. as immunotherapy tablet