Sitagliptin is an oral anti-diabetic medication containing of Sitagliptin, a highly selective Dipeptidyl Peptidase-4 (DPP-4) inhibitor. It is used to improve glycemic control in adults with Type 2 Diabetes Mellitus. Enhancing the body's natural incretin system helps regulate blood sugar levels primarily after meals. It is a weight-neutral treatment option that carries a low risk of hypoglycemia when used as monotherapy.

Sitagliptin is a prescription-strength glucose-lowering medication composed of Sitagliptin phosphate. It belongs to the "gliptin" class of drugs, which revolutionised the management of Type 2 Diabetes by focusing on the physiological response to food intake.

Composition and Mechanism: Each film-coated tablet contains Sitagliptin. The medication works by inhibiting the DPP-4 enzyme, which degrades incretin hormones, including glucagon-like peptide-1 (GLP-1). By keeping these hormones active for longer, Sitagliptin stimulates the pancreas to release insulin and reduces the liver's production of glucose, but only when blood sugar levels are elevated.

Primary Therapeutic Uses: Sitagliptin is indicated for the treatment of Type 2 Diabetes Mellitus as an adjunct to diet and exercise. It is widely used as monotherapy or in combination with other agents, such as Metformin, SGLT2 inhibitors, or Pioglitazone, to achieve target HbA1c levels.

Benefits and Precautions: Sitagliptin helps control blood sugar without causing weight gain or frequent low-sugar episodes that some older medicines can cause. It’s convenient for individuals with busy schedules because it only needs to be taken once daily. However, people who have had pancreatitis before or who have moderate to severe kidney disease need to be careful. In these cases, the dose may need to be adjusted to prevent accumulation of the medication in the body.

Medical Supervision and Risks: Sitagliptin should always be taken under a doctor’s supervision. It is generally safe, but patients should be aware of potential side effects. These can include allergic reactions and, rarely, joint pain or pancreas inflammation. Physicians will regularly monitor kidney function in patients taking Sitagliptin to ensure the medication is being used safely.

Sitagliptin (Sitagliptin 100mg) is indicated for:

Type 2 Diabetes Mellitus (T2DM)

To improve glycemic control in adults as monotherapy or in combination with other glucose-lowering agents.

HbA1c Reduction

Specifically targeted at lowering haemoglobin A1c levels to prevent long-term diabetic complications.

Combination Therapy

Often used with Metformin or Sulfonylureas when diet and exercise alone do not provide adequate control.

Sitagliptin offers a sophisticated approach to diabetes management by mimicking the body’s natural rhythm of insulin release. Because it works in a "glucose-dependent" manner, it provides a medicinal benefit that is highly specific; it helps lower blood sugar when it is high (after eating) but has almost no effect when blood sugar is normal. This significantly reduces the risk of sudden, dangerous drops in blood sugar that can lead to dizziness or fainting.

Another key benefit is its weight-neutral profile. Many diabetes medications cause patients to gain weight, which can worsen the underlying condition. Sitagliptin does not cause weight gain, making it an excellent choice for patients who are already struggling with obesity or those who wish to maintain their current weight while improving their metabolic health.

Furthermore, Sitagliptin is well-suited for long-term use due to its convenience and tolerability. Unlike many other anti-diabetics, it does not cause significant gastrointestinal distress (like bloating or diarrhoea). This makes it easier for patients to stick to their treatment plan, ensuring consistent blood sugar control and reducing the long-term risk of kidney damage, nerve pain, and vision loss.

Common Side Effects (Generally mild):

• Upper Respiratory Tract Infection: Stuffy or runny nose and sore throat.

• Headache: Usually mild and transient.

• Hypoglycemia: Specifically, when used in combination with insulin or sulfonylureas.

• Nasopharyngitis: Common cold symptoms.

Uncommon Side Effects:

• Osteoarthritis: Some patients report minor joint discomfort.

• Dizziness: Occasional lightheadedness.

• Gastrointestinal Upset: Nausea, flatulence, or constipation.

Serious Side Effects (Requires immediate medical attention):

• Pancreatitis: Severe and persistent abdominal pain that may radiate to the back, with or without vomiting.

• Severe Allergic Reactions: Anaphylaxis, angioedema (swelling of face/throat), or exfoliative skin conditions like Stevens-Johnson syndrome.

• Bullous Pemphigoid: A skin reaction causing large, fluid-filled blisters.

• Severe Joint Pain: Disabling pain in the joints that requires discontinuation of the drug.

• Timing: Take the tablet once daily at the same time each day.
• Method: Swallow the tablet whole with a glass of water. Do not crush or chew.
• With or Without Food: Sitagliptin may be taken with or without food.
• Consistency: Maintaining a regular schedule is vital to ensure the drug effectively inhibits the DPP-4 enzyme for a full 24 hours.

Sitagliptin works via the "Incretin Enhancer" mechanism:

1. Enzyme Inhibition: It binds to and inhibits the Dipeptidyl Peptidase-4 (DPP-4) enzyme.
2. Hormone Stabilisation: This inhibition prevents the breakdown of GLP-1 and GIP (incretin hormones) released by the gut in response to a meal.
3. Insulin/Glucagon Balance: Increased incretin levels signal the pancreatic beta cells to release more insulin and signal alpha cells to decrease glucagon secretion.
4. Blood Sugar Control: This results in decreased hepatic glucose production and increased muscle glucose uptake, thereby lowering blood glucose levels.

• Be Aware of Stomach Pain: If you experience severe, unrelenting stomach pain, stop the medication and call your doctor immediately.

• Check Your Feet: Always practice good foot hygiene as part of your diabetes management.

• Hydration: While Sitagliptin doesn't cause dehydration, staying hydrated supports overall kidney health.

• Monitor Blood Glucose: Keep a log of your blood glucose readings to show your physician during follow-up visits.

Store Sitagliptin at room temperature (below 30°C). Protect from light and moisture by keeping the tablets in their original packaging. Keep out of reach of children.

• General Nutrition: No specific food or fruit juice (including grapefruit) is known to interfere with Sitagliptin.

• Alcohol: Can affect blood sugar stability and increase the risk of rare metabolic complications.

Insulin / Glimepiride

SEVERE

Increases the risk of severe hypoglycemia. Insulin dose adjustment may be necessary.

Digoxin

CAUTION

Sitagliptin may slightly increase the levels of Digoxin in the blood; monitor levels closely.

Probenecid

MODERATE

May increase the concentration of Sitagliptin in the bloodstream.

• Renal Impairment: Patients with reduced kidney function may require a dose reduction (e.g., 25mg or 50mg) instead of the 100mg dose.

• Pancreatitis: A history of pancreatitis is a contraindication or requires extreme caution.

• Heart Failure: Use with caution, as some DPP-4 inhibitors have been linked to heart failure risks.

How to take (Info about daily dose)

The standard dose for adults with normal kidney function is tablet once daily.

• Standard Frequency: Once a day, preferably in the morning.

• Doctor's Direction: If your kidney function changes, your doctor may switch you to a lower strength. Never change the dose yourself.

If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and return to your regular schedule. Do not take two tablets at the same time.