Diabetes Medications: Metformin, Acarbose and more

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Questions and Answers

A patient with a history of alcoholism and cirrhosis presents with type 2 diabetes. Which oral hypoglycemic agent is most likely contraindicated due to the risk of exacerbating liver damage?

  • Acarbose
  • Pioglitazone (correct)
  • Sitagliptin
  • Metformin

A patient with type 2 diabetes develops severe nausea, diarrhea, and signs of dehydration during metformin treatment. Lab results reveal elevated serum lactate levels. Which complication is most likely occurring?

  • Lactic Acidosis (correct)
  • Hyperosmolar Hyperglycemic State (HHS)
  • Hypoglycemia
  • Diabetic Ketoacidosis (DKA)

An elderly patient with type 2 diabetes and a history of frequent falls is prescribed a sulfonylurea. What is the most concerning adverse effect to monitor for in this patient population?

  • Gastrointestinal Upset
  • Hypoglycemia (correct)
  • Edema
  • Weight Gain

A patient with type 2 diabetes and a history of heart failure is prescribed rosiglitazone. Which adverse effect requires immediate attention and discontinuation of the medication?

<p>Exacerbation of Heart Failure (D)</p> Signup and view all the answers

A patient with type 2 diabetes is started on sitagliptin. What is the primary mechanism by which sitagliptin improves glycemic control?

<p>Inhibiting the Breakdown of Incretin Hormones (C)</p> Signup and view all the answers

A patient with type 2 diabetes is prescribed repaglinide. When should the patient be instructed to take this medication in relation to meals?

<p>Immediately before meals (B)</p> Signup and view all the answers

A patient with hypothyroidism is started on levothyroxine. After several weeks, the patient reports palpitations, weight loss, and insomnia. What adjustment to the medication is most likely required?

<p>Decrease the dose (A)</p> Signup and view all the answers

A patient with gastroesophageal reflux disease (GERD) who has chronic kidney disease is prescribed an antacid. Which antacid component should be avoided in this patient population?

<p>Magnesium hydroxide (B)</p> Signup and view all the answers

A woman who is 8 weeks pregnant complains of frequent heartburn. Which medication is contraindicated during pregnancy due to its abortifacient properties?

<p>Misoprostol (B)</p> Signup and view all the answers

A patient with a history of C. difficile infection develops GERD and is prescribed a proton pump inhibitor (PPI) for long-term management. What monitoring is most important for this patient, considering their medical history?

<p>GI symptoms (D)</p> Signup and view all the answers

An elderly patient with Alzheimer's disease is prescribed donepezil. What is the primary mechanism of action of this medication in managing cognitive symptoms?

<p>Inhibiting acetylcholinesterase to increase acetylcholine levels (B)</p> Signup and view all the answers

A patient with Parkinson's disease is prescribed levodopa/carbidopa. Which of the following should the provider monitor to assess the effectiveness and potential side effects of this drug?

<p>Motor symptoms and blood pressure (C)</p> Signup and view all the answers

A patient with Parkinson's disease develops livedo reticularis (a skin rash) while taking amantadine. What is the appropriate course of action?

<p>Discontinue the medication (C)</p> Signup and view all the answers

A patient with moderate Alzheimer's disease is prescribed memantine. What is the primary mechanism of action of memantine in managing this condition?

<p>Blocking NMDA receptors (D)</p> Signup and view all the answers

A patient is started on carbamazepine for trigeminal neuralgia. What baseline laboratory test is most critical to obtain before initiating therapy?

<p>Complete blood count (CBC) (C)</p> Signup and view all the answers

A patient with epilepsy is treated with valproate. What potential adverse effect requires immediate discontinuation of the drug?

<p>Hepatotoxicity (B)</p> Signup and view all the answers

A patient with epilepsy is prescribed phenytoin and develops gingival hyperplasia. Which intervention is most appropriate?

<p>Improving oral hygiene (A)</p> Signup and view all the answers

A patient experiencing chronic constipation is recommended to use a bulk-forming laxative. What key instruction should the patient receive regarding its use?

<p>Drink plenty of water with it. (B)</p> Signup and view all the answers

A patient with an overactive bladder is started on oxybutynin. Which pre-existing condition would be a contraindication for this medication?

<p>Glaucoma (A)</p> Signup and view all the answers

A woman of childbearing age is prescribed ethinyl estradiol/norethindrone for contraception. Which pre-existing medical condition is an absolute contraindication to the use of this medication?

<p>History of blood clots (A)</p> Signup and view all the answers

A male patient is prescribed sildenafil for erectile dysfunction. Which medication is contraindicated with sildenafil due to the risk of severe hypotension?

<p>Nitrates (D)</p> Signup and view all the answers

A male patient is prescribed finasteride for benign prostatic hyperplasia (BPH). What key information regarding adverse effects should the patient be counseled on?

<p>Decreased libido (A)</p> Signup and view all the answers

A patient with type 2 diabetes taking metformin reports persistent abdominal discomfort. What is the most appropriate initial intervention?

<p>Reduce the dose and gradually increase as tolerated (C)</p> Signup and view all the answers

An elderly patient with type 2 diabetes on a sulfonylurea is found unresponsive. A blood glucose check reveals a level of 40 mg/dL. What is the most appropriate immediate intervention?

<p>Administer dextrose intravenously (B)</p> Signup and view all the answers

A patient with hypothyroidism is started on levothyroxine but continues to experience symptoms despite adequate TSH suppression. What should be evaluated next?

<p>All of the above (D)</p> Signup and view all the answers

A patient with gastroesophageal reflux disease (GERD) is prescribed omeprazole for long-term use. What potential long-term effect requires monitoring, particularly in elderly patients?

<p>Osteoporosis (D)</p> Signup and view all the answers

An Alzheimer's patient taking donepezil experiences new-onset bradycardia. What is the most appropriate course of action?

<p>Monitor heart rate; ensure no other cardiac issues (A)</p> Signup and view all the answers

A patient with Parkinson's disease develops dyskinesias while taking levodopa/carbidopa. What adjustment to the medication regimen might be considered?

<p>Decreasing the levodopa/carbidopa dose (B)</p> Signup and view all the answers

A patient with epilepsy who is taking carbamazepine develops hyponatremia. What is the most appropriate course of action?

<p>Restrict fluid intake (A)</p> Signup and view all the answers

Which medication is most likely to cause gingival hyperplasia as a significant adverse effect?

<p>Phenytoin (A)</p> Signup and view all the answers

A patient with constipation is recommended to use an osmotic laxative like lactulose. What is the primary mechanism of action of this type of laxative?

<p>Drawing water into the bowel to increase stool water content (C)</p> Signup and view all the answers

A patient taking ethinyl estradiol/norethindrone complains of breakthrough bleeding. What should she be advised to do?

<p>Continue the medication as prescribed (D)</p> Signup and view all the answers

A patient taking finasteride for BPH reports decreased libido and erectile dysfunction. What is the most appropriate initial step in managing this side effect?

<p>Reduce the dose of the medication (D)</p> Signup and view all the answers

A patient with type 2 diabetes is newly prescribed acarbose. What dietary instruction is most important for this patient?

<p>Take acarbose with every meal (C)</p> Signup and view all the answers

A patient with type 2 diabetes asks about potential adverse effects of metformin. What symptom should the patient be told to watch for that would warrant immediate medical attention?

<p>Muscle aches and weakness (A)</p> Signup and view all the answers

A patient with hypothyroidism taking levothyroxine complains of palpitations. What potential drug interaction requires assessment?

<p>Decongestants (A)</p> Signup and view all the answers

Which medication presents the greatest risk of causing hypoglycemia when used as monotherapy?

<p>Glyburide (B)</p> Signup and view all the answers

Which of the following should be avoided in a patient with renal failure?

<p>Antacids (Aluminum Hydroxide, Magnesium Hydroxide, Calcium Carbonate, Sodium Bicarbonate, Magaldrate Combo) (A)</p> Signup and view all the answers

A patient is taking Donepezil/Aricept. What is a serious adverse effect that requires immediate treatment?

<p>Hypersensitivity (D)</p> Signup and view all the answers

Flashcards

Metformin: Mechanism of Action?

Increases insulin sensitivity, reduces hepatic glucose production & increases peripheral glucose uptake.

Metformin: Primary Indication?

Type 2 diabetes mellitus

Metformin: Contraindications?

Renal impairment, metabolic acidosis, severe infection, dehydration

Metformin: Common Adverse Effects?

GI upset (nausea, diarrhea), lactic acidosis (rare but serious)

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Metformin: Monitoring Parameters?

Renal function (serum creatinine), Vitamins B12, liver function

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Alpha-glucosidase Inhibitors: Action?

Inhibits intestinal enzymes that break down carbohydrates into glucose, delaying glucose absorption.

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Alpha-glucosidase Inhibitors: Indication?

Type 2 diabetes mellitus

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Alpha-glucosidase Inhibitors: Avoid in?

Inflammatory bowel/intestinal diseases, renal impairment.

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Alpha-glucosidase Inhibitors: Side Effects?

Flatulence, diarrhea, abdominal pain

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Alpha-glucosidase Inhibitors: Monitor?

Blood glucose and liver function

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Sulfonylureas: Primary Action?

Stimulates insulin release from pancreatic β-cells.

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Sulfonylureas: Main Indication?

Type 2 diabetes mellitus

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Sulfonylureas: When to Avoid?

Type 1 diabetes, diabetic ketoacidosis, sulfa allergy.

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Sulfonylureas: Key Adverse Effects?

Hypoglycemia and weight gain

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Sulfonylureas: What to Monitor?

Blood glucose levels

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Thiazolidinediones: Action?

Increases insulin sensitivity by activating PPAR-γ receptors.

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Thiazolidinediones: Indication?

Type 2 diabetes mellitus

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Thiazolidinediones: When to Avoid?

Heart failure and active liver disease.

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Thiazolidinediones: Side Effects?

Edema, weight gain, risk of fractures, heart failure

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Thiazolidinediones: Monitored How?

Liver function, heart function, and weight

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DPP-4 Inhibitors: Action?

Inhibits DPP-4, prolonging incretin hormone action, increasing insulin release.

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DPP-4 Inhibitors: Indication?

Type 2 diabetes mellitus

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DPP-4 Inhibitors: Avoid When?

Renal impairment (dose adjustment required).

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DPP-4 Inhibitors: Common Side Effects?

Headache, upper respiratory tract infections, pancreatitis (rare).

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DPP-4 Inhibitors:Monitored How?

Renal function.

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Meglitinides- Action?

Stimulates insulin release from pancreatic B-cells.

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Meglitinides-Indication?

Type 2 diabetes mellitus

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Meglitinides-Avoid in?

Type 1 diabetes, diabetic ketoacidosis.

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Meglitinides- Side effects?

Hypoglycemia and weight gain

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Meglitinides-Monitor?

Blood glucose levels.

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Levothyroxine: Action

Synthetic form of thyroid hormone, replaces deficient thyroid hormone.

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Levothyroxine: Indication?

Hypothyroidism

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Levothyroxine: Avoid?

Hyperthyroidism, acute myocardial infarction (MI)

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Levothyroxine: Side Effects?

Palpitations, weight loss, anxiety, insomnia

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Levothyroxine: Monitor?

Thyroid function (TSH, Free T4), heart rate

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Antacids: Action?

Neutralizes gastric acid.

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Antacids: Indication?

GERD, peptic ulcer disease

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Antacids: Avoid?

Renal failure

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Antacids: Side Effects?

Constipation (aluminum), diarrhea (magnesium), hypercalcemia (calcium)

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Antacids: Monitor?

Electrolyte levels

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Study Notes

Biguanide/Metformin

  • Increases insulin sensitivity
  • Reduces hepatic glucose production
  • Increases peripheral glucose uptake
  • Indicated for Type 2 diabetes mellitus
  • Should not be used in individuals with renal impairment, metabolic acidosis, severe infection, or dehydration
  • Can cause gastrointestinal upset such as nausea and diarrhea
  • Rare but serious adverse effect is lactic acidosis
  • Monitor renal function (serum creatinine), liver function, and vitamin B12 levels

Alpha-glucosidase Inhibitors (Acarbose, Miglitol)

  • Inhibits intestinal enzymes that break down complex carbohydrates into glucose
  • Delays glucose absorption
  • Indicated for Type 2 diabetes mellitus
  • Contraindicated in inflammatory bowel disease, chronic intestinal diseases, and renal impairment
  • Can cause flatulence, diarrhea, and abdominal pain
  • Monitor blood glucose levels and liver function

Sulfonylureas (1st and 2nd Generation)

  • Stimulates insulin release from pancreatic β-cells
  • Indicated for Type 2 diabetes mellitus
  • Avoid in Type 1 diabetes, diabetic ketoacidosis, and sulfa allergy
  • Can cause hypoglycemia and weight gain
  • Should have blood glucose levels monitored

Thiazolidinediones (Pioglitazone, Rosiglitazone)

  • Increases insulin sensitivity by activating PPAR-γ receptors
  • Indicated for Type 2 diabetes mellitus
  • Contraindicated in heart failure and active liver disease
  • Can cause edema, weight gain, risk of fractures, and heart failure
  • Monitor liver function, heart function, and weight

Dipeptidyl Peptidase-4 Inhibitors (Sitagliptin, Saxagliptin)

  • Inhibits DPP-4, prolonging the action of incretin hormones
  • Increases insulin release
  • Indicated for Type 2 diabetes mellitus
  • Should not be prescribed if there is renal impairment; dose adjustment is required
  • Can cause headache, upper respiratory tract infections, and, rarely, pancreatitis
  • Monitor renal function

Meglitinides (Repaglinide, Nateglinide)

  • Stimulates insulin release from pancreatic β-cells
  • Indicated for Type 2 diabetes mellitus
  • Avoid in Type 1 diabetes and diabetic ketoacidosis
  • Adverse effects include hypoglycemia and weight gain
  • Monitor blood glucose levels

Levothyroxine

  • Synthetic form of thyroid hormone
  • Replaces deficient thyroid hormone
  • Indicated for hypothyroidism
  • Contraindicated in hyperthyroidism and acute myocardial infarction
  • Can cause palpitations, weight loss, anxiety, and insomnia (in excess)
  • Monitor thyroid function (TSH, Free T4) and heart rate

Antacids (Aluminum Hydroxide, Magnesium Hydroxide, Calcium Carbonate, Sodium Bicarbonate, Magaldrate Combo)

  • Neutralizes gastric acid
  • Indicated for gastroesophageal reflux disease (GERD) and peptic ulcer disease
  • Contraindicated in renal failure (in some cases)
  • Aluminum causes constipation, magnesium causes diarrhea, and calcium causes hypercalcemia
  • Monitor electrolyte levels

Misoprostol

  • Prostaglandin analog
  • Increases mucous production and reduces acid secretion
  • Can prevent NSAID-induced gastric ulcers
  • Can induce labor
  • Contraindicated in pregnancy because it causes abortion
  • Can cause diarrhea, abdominal cramps, and uterine rupture
  • Monitor pregnancy status and GI symptoms

Omeprazole

  • It is a proton pump inhibitor (PPI)
  • inhibits gastric acid secretion
  • Indicated for GERD and peptic ulcers
  • Should not be used if there is hypersensitivity to omeprazole
  • Can cause headache, diarrhea, and increases the risk of C. difficile infection with long-term use
  • Monitor GI symptoms, calcium and vitamin B12 levels (with long-term use)

Donepezil/Aricept

  • Is an acetylcholinesterase inhibitor
  • Increases acetylcholine levels in the brain
  • Indicated for Alzheimer’s disease
  • Contraindicated for hypersensitivity to donepezil
  • Can cause nausea, diarrhea, and bradycardia
  • Monitor cognitive function and heart rate

Levodopa/Carbidopa

  • Levodopa isConverted to dopamine
  • Carbidopa prevents its breakdown before reaching the brain
  • Indicated for Parkinson’s disease
  • Contraindicated if narrow-angle glaucoma, recent MAOI use
  • Can cause dyskinesias, nausea, orthostatic hypotension
  • Monitor motor symptoms and blood pressure

Levodopa

  • Converts to dopamine in the brain
  • Increases dopamine levels
  • Indicated for Parkinson’s disease
  • Contraindicated if narrow-angle glaucoma, recent MAOI use
  • Can cause dyskinesias, nausea, orthostatic hypotension
  • Monitor motor symptoms and blood pressure

Amantadine

  • Increases dopamine release and inhibits dopamine reuptake
  • Indicated for Parkinson’s disease, influenza A prophylaxis
  • Contraindicated if severe renal impairment
  • Can cause confusion, dizziness, livedo reticularis (skin rash)
  • Monitor renal function and mental status

Galantamine

  • Is an acetylcholinesterase inhibitor
  • Increases acetylcholine in the brain
  • Indicated for Alzheimer’s disease
  • Contraindicated if hypersensitivity to galantamine
  • Can cause nausea, diarrhea, and bradycardia
  • Monitor cognitive function and heart rate

Rivastigmine

  • Is an acetylcholinesterase inhibitor
  • Increases acetylcholine in the brain
  • Indicated for Alzheimer’s disease and Parkinson’s disease dementia
  • Contraindicated for hypersensitivity to rivastigmine
  • Can cause nausea, diarrhea, and bradycardia
  • Monitor cognitive function and heart rate

Memantine

  • Is an NMDA receptor antagonist
  • Reduces glutamate excitotoxicity
  • Indicated for moderate to severe Alzheimer’s disease
  • Contraindicated if hypersensitivity to memantine
  • Can cause dizziness, confusion, and headache
  • Monitor cognitive function and renal function

Carbamazepine

  • Inhibits voltage-gated sodium channels
  • Stabilizes neuronal membranes
  • Indicated for epilepsy, bipolar disorder, and trigeminal neuralgia
  • Contraindicated if bone marrow suppression, hypersensitivity to carbamazepine
  • Can cause drowsiness, dizziness, and hyponatremia
  • Monitor CBC, liver function, and sodium levels

Valproate

  • Inhibits voltage-gated sodium channels and increases GABA activity
  • Indicated for epilepsy and bipolar disorder
  • Should not be prescribed to individuals with hepatic disease and urea cycle disorders
  • Can cause hepatotoxicity, pancreatitis, and tremor
  • Monitor liver function, CBC, and serum valproate levels

Phenytoin

  • Inhibits voltage-gated sodium channels
  • Stabilizes neuronal membranes
  • Indicated for epilepsy and status epilepticus
  • Contraindicated if hypersensitivity to phenytoin and bradycardia
  • Can cause gingival hyperplasia, ataxia, and rash
  • Monitor serum phenytoin levels and liver function

Laxative Classes

  • Bulk-forming (e.g., Psyllium)
    • Absorbs water into the stool, making it easier to pass
    • Indicated for constipation
    • Contraindicated in intestinal obstruction
    • Can cause bloating and abdominal cramping
    • Monitor bowel movement frequency
  • Surfactant (e.g., Docusate)
    • Increases water absorption in the stool
    • Indicated for constipation
    • Contraindicated in intestinal obstruction
    • Can cause abdominal cramping and diarrhea
    • Monitor bowel movement frequency
  • Stimulant (e.g., Bisacodyl, Senna)
    • Stimulates peristalsis and water secretion into the intestines
    • Indicated for acute constipation
    • Contraindicated in intestinal obstruction and abdominal pain
    • Can cause abdominal cramping and diarrhea
    • Monitor bowel movement frequency
  • Osmotic (e.g., Lactulose, PEG)
    • Draws water into the bowel, increasing stool water content
    • Indicated for constipation and hepatic encephalopathy
    • Contraindicated in intestinal obstruction
    • Can cause bloating and diarrhea
    • Monitor bowel movement frequency and electrolytes

Oxybutynin

  • Is an anticholinergic
  • Inhibits bladder muscle contractions.
  • Indicated for overactive bladder
  • Contraindicated if glaucoma, urinary retention
  • Can cause dry mouth, constipation, dizziness
  • Monitor urinary symptoms and mental status

Ethinyl Estradiol/Norethindrone

  • Is a combination of estrogen and progestin
  • Inhibits ovulation
  • Indicated for contraception, menstrual regulation
  • Contraindicated for history of blood clots and breast cancer
  • Can cause nausea, weight gain, and mood changes
  • Monitor blood pressure and menstrual cycle

Norethindrone (Mini-Pills)

  • Is a progestin-only contraception
  • Prevents ovulation
  • Indicated for contraception
  • Contraindicated if history of blood clots and liver disease
  • Can cause spotting, headache, and mood changes
  • Monitor blood pressure and menstrual cycle

Sildenafil

  • Phosphodiesterase-5 inhibitor
  • Increases blood flow to the penis
  • Indicated for erectile dysfunction, pulmonary hypertension
  • Contraindicated if nitrate use
  • Can cause headache, flushing, and visual disturbances
  • Monitor blood pressure and cardiac symptoms

Finasteride

  • 5-alpha-reductase inhibitor
  • Reduces dihydrotestosterone levels
  • Indicated for benign prostatic hyperplasia (BPH), male pattern baldness
  • Contraindicated in pregnancy as it has teratogenic effects
  • Can cause decreased libido and erectile dysfunction
  • Monitor prostate-specific antigen (PSA) levels

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