Product Information

Registration Status: Active

MYONIT INSTA NITROGLYCERIN SUBLINGUAL TABLETS USP 0.5MG is approved to be sold in Singapore with effective from 2019-05-31. It is marketed by TRINITY PHARMACEUTICALS & FOOD PTE LTD, with the registration number of SIN15702P.

This product contains Nitroglycerin 0.5mg in the form of TABLET. It is approved for Not Available use.

This product is manufactured by Troikaa Pharmaceuticals Limited in INDIA.

It is a Pharmacy Only Medicine that can be obtained from a pharmacist at a retail pharmacy.



A volatile vasodilator which relieves angina pectoris by stimulating guanylate cyclase and lowering cytosolic calcium. [PubChem]


For the prevention of angina

Mechanism of Action

Similar to other nitrites and organic nitrates, nitroglycerin is converted to nitric oxide (NO), an active intermediate compound which activates the enzyme guanylate cyclase. This stimulates the synthesis of cyclic guanosine 3',5'-monophosphate (cGMP) which then activates a series of protein kinase-dependent phosphorylations in the smooth muscle cells, eventually resulting in the dephosphorylation of the myosin light chain of the smooth muscle fiber. The subsequent release of calcium ions results in the relaxation of the smooth muscle cells and vasodilation.


* 1 L/kg/min


Increased intracranial pressure, with any or all of persistent throbbing headache, confusion, and moderate fever; Vertigo; Palpitations; Visual disturbances; Nausea and vomiting (possibly with colic and even bloody diarrhea); Syncope (especially in the upright posture); Air hunger and dyspnea, later followed by reduced ventilatory effort; Diaphoresis, with the skin either flushed or cold and clammy; Heart block and bradycardia; Paralysis; Coma; Seizures; Death.

Active Ingredient/Synonyms

1,2,3-Propanetrioltrinitrate | 1,2,3-Propanetriyl nitrate | Glycerin trinitrate | Glycerol trinitrate | Glycerol, nitric acid triester | Glyceroli trinitratis | Glyceroltrinitrat | Glyceryl trinitrate | Natispray | NG | Nitroglicerina | Nitroglycerin | Nitroglycerine | Nitroglycerol | Nitromed | Propane-1,2,3-triyl trinitrate | Rectogesic | Trinitrine | Trinitroglycerin | Trinitroglycerol | Nitroglycerin |

Source of information: Drugbank (External Link). Last updated on: 3rd July 18. *Trade Name used in the content below may not be the same as the HSA-registered product.


  1. Health Science Authority of Singapore - Reclassified POM
  2. Drugbank