Humulin N U-100 Kwikpen Inj 3ml

Manufacturer LILLY Active Ingredient Insulin NPH (InnoLets, Pens, and PenFill Cartridges)(IN soo lin N P H) Pronunciation IN-soo-lin N-P-H
It is used to lower blood sugar in patients with high blood sugar (diabetes).
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Drug Class
Antidiabetic agent
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Pharmacologic Class
Insulin, intermediate-acting
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Pregnancy Category
Category B
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FDA Approved
Jun 1982
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DEA Schedule
Not Controlled

Overview

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What is this medicine?

Humulin N is a type of insulin that helps your body use sugar for energy. It's an intermediate-acting insulin, meaning it starts working a few hours after you inject it and lasts for a longer period, helping to control your blood sugar throughout the day or overnight. It's used to treat diabetes.
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How to Use This Medicine

Proper Use of This Medication

To use this medication correctly, follow your doctor's instructions and read all the information provided. This medication is administered via injection into the fatty tissue of the skin in the upper arm, thigh, buttocks, or stomach area. If you will be self-administering the injection, your doctor or nurse will instruct you on the proper technique.

Preparing the Medication

Before use, this medication must be mixed according to the instructions provided by your doctor. The solution should appear cloudy and milky when ready for use. Do not use the medication if the solution is clear, has lumps, or if powder is stuck to the sides of the container. Additionally, do not use the medication if the solution is leaking, has particles, or has changed color.

Choosing the Injection Site

Avoid injecting the medication into skin that is thickened, has pits or lumps, or is irritated, tender, bruised, red, scaly, hard, scarred, or has stretch marks. Rotate the injection site with each use to minimize the risk of skin reactions.

Disposing of Needles and Supplies

Dispose of used needles in a designated needle/sharp disposal box. Do not reuse needles or other supplies. When the box is full, follow local regulations for proper disposal. If you have any questions, consult your doctor or pharmacist.

Diet and Exercise

Follow the diet and exercise plan recommended by your doctor while using this medication.

Important Administration Instructions

This medication must not be used in an insulin pump. If you have questions, consult your doctor.
Remove all pen needle covers before injecting a dose (there may be 2). If you are unsure about the type of pen needle or how to use it, consult your doctor.
Remove the needle after each injection and do not store the device with the needle attached.
Be aware that this product may make a clicking sound when preparing the dose. However, do not rely on the clicks to determine the dose, as this could lead to an incorrect dose.
* Do not transfer this medication from the pen to a syringe.

Storage and Disposal

Store unopened containers in the refrigerator, but do not freeze. If an unopened container has been stored at room temperature, consult your doctor or pharmacist to determine how long it can be safely used. Do not use the medication if it has been frozen.

Missed Doses

If you miss a dose, take it as soon as you remember. However, if it is close to the time for your next injection, skip the missed dose and resume your regular schedule. Do not take two doses at the same time or extra doses.
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Lifestyle & Tips

  • Always check your blood sugar levels as instructed by your doctor.
  • Follow a consistent meal plan and exercise routine.
  • Learn proper injection technique and rotate injection sites to prevent skin problems.
  • Never share your KwikPen or needles with others, even if the needle is changed.
  • Always have a source of fast-acting sugar (e.g., glucose tablets, juice) readily available to treat low blood sugar.
  • Inform your healthcare provider about all medications, supplements, and herbal products you are taking.

Dosing & Administration

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Adult Dosing

Standard Dose: Individualized based on patient's metabolic needs, typically 0.5-1 unit/kg/day total insulin, often given as 1-2 injections per day (e.g., before breakfast and/or at bedtime).
Dose Range: 0.1 - 2.5 mg

Condition-Specific Dosing:

Type 1 Diabetes: Initial dose often 0.5-0.8 units/kg/day, with NPH comprising 30-50% of total daily dose, split into 1-2 injections.
Type 2 Diabetes: Initial dose often 0.1-0.2 units/kg/day or 10 units at bedtime, adjusted based on blood glucose levels.
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Pediatric Dosing

Neonatal: Not established (use rapid/short-acting insulins with continuous infusion for neonates)
Infant: Dosing individualized, typically 0.2-0.5 units/kg/day, adjusted based on blood glucose. NPH may be used in specific regimens.
Child: Dosing individualized, typically 0.5-1 unit/kg/day, adjusted based on blood glucose. NPH is commonly used as basal insulin.
Adolescent: Dosing individualized, typically 0.8-1.2 units/kg/day during puberty, adjusted based on blood glucose. NPH is commonly used as basal insulin.
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Dose Adjustments

Renal Impairment:

Mild: May require dose reduction; monitor blood glucose closely.
Moderate: Significant dose reduction often required; monitor blood glucose closely.
Severe: Significant dose reduction often required; monitor blood glucose closely. Insulin requirements may decrease by 25-50% or more.
Dialysis: Insulin requirements typically decrease. Administer after dialysis session if possible to avoid hypoglycemia. Close monitoring is essential.

Hepatic Impairment:

Mild: May require dose reduction; monitor blood glucose closely.
Moderate: Dose reduction often required; monitor blood glucose closely.
Severe: Significant dose reduction often required; monitor blood glucose closely. Increased risk of hypoglycemia.

Pharmacology

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Mechanism of Action

Insulin NPH (Isophane) is an intermediate-acting insulin. It lowers blood glucose by stimulating peripheral glucose uptake, especially by skeletal muscle and fat, and by inhibiting hepatic glucose production. Insulin also inhibits lipolysis and proteolysis, and enhances protein synthesis.
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Pharmacokinetics

Absorption:

Bioavailability: Approximately 50-80% (subcutaneous, highly variable)
Tmax: 6-10 hours (highly variable, range 4-12 hours)
FoodEffect: No direct food effect on absorption, but meal timing relative to injection is critical for glycemic control.

Distribution:

Vd: Approximately 0.1 L/kg (similar to extracellular fluid volume)
ProteinBinding: Very low (<10%)
CnssPenetration: Limited (does not readily cross the blood-brain barrier in significant amounts, but has central effects)

Elimination:

HalfLife: Functional half-life is prolonged due to slow absorption from subcutaneous depot (effective half-life is related to duration of action, not true elimination half-life of insulin molecule which is minutes).
Clearance: Approximately 0.8-1.2 L/min (renal and hepatic clearance)
ExcretionRoute: Renal (approximately 60%) and hepatic (approximately 40%)
Unchanged: <2% (very little unchanged insulin is excreted)
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Pharmacodynamics

OnsetOfAction: 1-4 hours
PeakEffect: 4-12 hours
DurationOfAction: 14-24 hours

Safety & Warnings

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Side Effects

Urgent Side Effects: Seek Medical Help Right Away

Although rare, some people may experience severe and potentially life-threatening side effects while taking this medication. If you notice any of the following symptoms, contact your doctor or seek medical attention immediately:

Signs of an allergic reaction, such as:
+ Rash
+ Hives
+ Itching
+ Red, swollen, blistered, or peeling skin with or without fever
+ Wheezing
+ Tightness in the chest or throat
+ Trouble breathing, swallowing, or talking
+ Unusual hoarseness
+ Swelling of the mouth, face, lips, tongue, or throat
Note: In rare cases, allergic reactions can be life-threatening.
Signs of low potassium levels, including:
+ Muscle pain or weakness
+ Muscle cramps
+ An irregular heartbeat
Swelling in the arms or legs
Thick skin, pits, or lumps at the injection site
Low blood sugar, which may cause:
+ Dizziness or fainting
+ Blurred vision
+ Mood changes
+ Slurred speech
+ Headache
+ Feeling sleepy or weak
+ Shaking
+ Fast heartbeat
+ Confusion
+ Hunger
+ Sweating
+ Seizures

If you experience any of these symptoms, call your doctor right away. If you have low blood sugar, follow the instructions you have been given, which may include taking glucose tablets, liquid glucose, or some fruit juices.

Other Possible Side Effects

Like all medications, this drug can cause side effects. However, many people do not experience any side effects or only have mild ones. If you are bothered by any of the following side effects or if they do not go away, contact your doctor or seek medical attention:

Irritation at the injection site
Weight gain

This is not a complete list of possible side effects. If you have questions or concerns about side effects, talk to your doctor. You can also report side effects to the FDA at 1-800-332-1088 or online at https://www.fda.gov/medwatch.
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Seek Immediate Medical Attention If You Experience:

  • Symptoms of low blood sugar (hypoglycemia): sweating, shaking, fast heartbeat, hunger, confusion, dizziness, irritability, blurred vision, headache.
  • Symptoms of high blood sugar (hyperglycemia): increased thirst, increased urination, fatigue, blurred vision, unexplained weight loss.
  • Signs of allergic reaction: rash, itching, swelling of face/tongue/throat, severe dizziness, trouble breathing.
  • Injection site reactions: redness, swelling, itching, pain, or changes in skin thickness (lipodystrophy) at the injection site.
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Before Using This Medicine

Before Taking This Medication: Important Information to Share with Your Doctor

It is essential to inform your doctor about the following:

Any allergies you have, including allergies to this medication, its components, or other substances, such as foods or drugs. Be sure to describe the symptoms you experienced as a result of the allergy.
If you have low blood sugar (hypoglycemia), as this may affect your treatment.

Additionally, this medication may interact with other health conditions or medications. To ensure your safety, it is crucial to provide your doctor and pharmacist with a comprehensive list of:

All prescription and over-the-counter (OTC) medications you are currently taking
Any natural products or vitamins you are using
* Your existing health problems

Do not start, stop, or modify the dosage of any medication without first consulting your doctor to confirm that it is safe to do so in conjunction with this medication.
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Precautions & Cautions

It is essential to inform all your healthcare providers, including doctors, nurses, pharmacists, and dentists, that you are taking this medication.

This drug can cause low blood sugar, which may lead to seizures, loss of consciousness, permanent brain damage, and even death if not properly managed. It is crucial to discuss this risk with your doctor. Additionally, this medication can cause low blood potassium levels, which, if left untreated, can result in abnormal heart rhythms, severe breathing difficulties, and potentially death. If you experience any symptoms, consult your doctor promptly.

Until you understand how this medication affects you, avoid driving and other activities that require your full attention. Certain diabetes medications, such as pioglitazone or rosiglitazone, can increase the risk of heart failure, especially when used in conjunction with insulin. If you are taking one of these medications, consult your doctor to discuss the potential risks.

Ensure you are using the correct insulin product, as they come in various containers, including vials, cartridges, and pens. If you are unsure about measuring or preparing your dose, consult your doctor or pharmacist for guidance.

During periods of stress, such as illness, infection, injury, or surgery, it may be more challenging to control your blood sugar levels. Changes in physical activity, exercise, or diet can also impact your blood sugar levels.

Wear a medical alert identification to ensure prompt care in case of an emergency. Avoid driving if you have experienced low blood sugar, as it can increase your risk of being involved in an accident. Monitor your blood sugar levels as directed by your doctor and undergo regular blood tests as scheduled.

Before consuming alcohol or using products containing alcohol, consult your doctor to discuss potential risks. Never share your insulin product, including pens, cartridge devices, needles, or syringes, with others, even if the needle has been changed, as this can transmit infections.

If you are 65 or older, use this medication with caution, as you may be more susceptible to side effects. Inform your doctor if you are pregnant, plan to become pregnant, or are breastfeeding, as you will need to discuss the benefits and risks of this medication for both you and your baby.
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Overdose Information

Overdose Symptoms:

  • Severe hypoglycemia (extremely low blood sugar)
  • Confusion
  • Seizures
  • Loss of consciousness
  • Coma

What to Do:

Immediately consume a source of fast-acting sugar (e.g., glucose tablets, fruit juice, regular soda, honey). If the person is unconscious or unable to swallow, administer glucagon if available and call emergency services (e.g., 911 or 1-800-222-1222 for Poison Control).

Drug Interactions

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Major Interactions

  • Non-selective beta-blockers (can mask symptoms of hypoglycemia and prolong hypoglycemic episodes)
  • Thiazolidinediones (TZDs) (increased risk of fluid retention and heart failure when used with insulin)
  • Alcohol (can potentiate hypoglycemic effect)
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Moderate Interactions

  • Corticosteroids (can increase blood glucose, requiring higher insulin doses)
  • Diuretics (thiazide and loop diuretics can increase blood glucose)
  • Sympathomimetics (e.g., decongestants, can increase blood glucose)
  • Atypical antipsychotics (can cause hyperglycemia)
  • Protease inhibitors (can cause hyperglycemia or hypoglycemia)
  • Sulfonylureas, Meglitinides (increased risk of hypoglycemia when co-administered)
  • GLP-1 receptor agonists, DPP-4 inhibitors (increased risk of hypoglycemia when co-administered, especially with sulfonylureas or insulin)
  • Salicylates (e.g., high-dose aspirin, can enhance insulin's glucose-lowering effect)
  • ACE inhibitors, Angiotensin Receptor Blockers (ARBs) (can enhance insulin's glucose-lowering effect)
  • Octreotide, Lanreotide (can increase or decrease insulin requirements)
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Minor Interactions

  • Certain herbal supplements (e.g., fenugreek, ginseng, bitter melon may lower blood glucose)

Monitoring

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Baseline Monitoring

HbA1c

Rationale: To establish baseline glycemic control and guide initial dosing.

Timing: Prior to initiation of therapy.

Fasting Plasma Glucose (FPG)

Rationale: To establish baseline glucose levels.

Timing: Prior to initiation of therapy.

Renal function (SCr, eGFR)

Rationale: To assess kidney function as insulin clearance is partly renal; dose adjustment may be needed.

Timing: Prior to initiation of therapy.

Hepatic function (ALT, AST)

Rationale: To assess liver function as insulin is metabolized by the liver; dose adjustment may be needed.

Timing: Prior to initiation of therapy.

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Routine Monitoring

Self-Monitoring Blood Glucose (SMBG)

Frequency: Multiple times daily (e.g., pre-meal, 2-hour post-meal, bedtime, and occasionally 3 AM) depending on regimen and glycemic control.

Target: Individualized, typically 80-130 mg/dL pre-meal, <180 mg/dL post-meal.

Action Threshold: Hypoglycemia (<70 mg/dL), Hyperglycemia (>180-250 mg/dL depending on target).

HbA1c

Frequency: Every 3-6 months (or more frequently if glycemic targets are not met or therapy is changed).

Target: Individualized, typically <7% for most adults.

Action Threshold: >7% (consider therapy adjustment).

Signs/symptoms of hypoglycemia

Frequency: Daily, patient education on recognition.

Target: N/A

Action Threshold: Any occurrence of symptoms (e.g., sweating, tremor, confusion, hunger).

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Symptom Monitoring

  • Symptoms of hypoglycemia (e.g., sweating, tremor, palpitations, hunger, confusion, dizziness, irritability, blurred vision, headache, slurred speech, anxiety, weakness, seizures, unconsciousness)
  • Symptoms of hyperglycemia (e.g., polyuria, polydipsia, polyphagia, fatigue, blurred vision, weight loss)
  • Signs of injection site reactions (e.g., redness, swelling, itching, lipodystrophy)

Special Patient Groups

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Pregnancy

Insulin is the preferred treatment for diabetes in pregnancy (pre-existing or gestational diabetes) due to its efficacy and safety profile. NPH insulin is commonly used as a basal insulin during pregnancy.

Trimester-Specific Risks:

First Trimester: No increased risk of congenital malformations associated with insulin use. Strict glycemic control is crucial to prevent adverse fetal outcomes.
Second Trimester: Insulin requirements typically increase during the second and third trimesters due to increasing insulin resistance.
Third Trimester: Insulin requirements continue to increase. Close monitoring of blood glucose is essential to prevent macrosomia and other complications.
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Lactation

Insulin is considered safe for use during breastfeeding. Insulin is a large protein molecule and is not excreted into breast milk in clinically significant amounts. It is not expected to cause adverse effects in a breastfed infant.

Infant Risk: L1 (Safest - compatible with breastfeeding)
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Pediatric Use

Insulin NPH is commonly used in children and adolescents with Type 1 and some Type 2 diabetes. Dosing is highly individualized based on age, weight, pubertal status, and glycemic targets. Close monitoring for hypoglycemia is crucial.

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Geriatric Use

Older adults may be more susceptible to hypoglycemia due to impaired renal function, reduced counter-regulatory responses, and polypharmacy. Lower starting doses and careful titration are recommended. Glycemic targets may be less stringent to avoid hypoglycemia.

Clinical Information

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Clinical Pearls

  • NPH insulin is a cloudy suspension and must be gently rolled or inverted several times before each injection to ensure uniform suspension.
  • NPH can be mixed with regular (short-acting) insulin in the same syringe, but it should be drawn up after the regular insulin (clear before cloudy).
  • Injection sites should be rotated to prevent lipodystrophy (fat accumulation or atrophy) which can affect insulin absorption.
  • Patients should be educated on the signs and symptoms of hypoglycemia and how to treat it promptly.
  • Timing of NPH injection relative to meals and bedtime is crucial for optimal glycemic control and to minimize nocturnal hypoglycemia.
  • Humulin N KwikPen is a prefilled pen device; patients must be trained on its proper use, including attaching a new needle for each injection and performing an air shot.
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Alternative Therapies

  • Other intermediate-acting insulins (e.g., Novolin N)
  • Long-acting insulins (e.g., insulin glargine, insulin detemir, insulin degludec) for basal insulin needs
  • Short-acting insulins (e.g., regular insulin) for mealtime coverage
  • Rapid-acting insulins (e.g., insulin lispro, insulin aspart, insulin glulisine) for mealtime coverage
  • Oral antidiabetic agents (e.g., metformin, sulfonylureas, DPP-4 inhibitors, SGLT2 inhibitors, GLP-1 receptor agonists) for Type 2 Diabetes.
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Cost & Coverage

Average Cost: $100 - $300 per 5 x 3ml KwikPens (U-100)
Generic Available: Yes
Insurance Coverage: Tier 2 or Tier 3 (preferred brand or non-preferred brand, often covered by most plans)
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General Drug Facts

If your symptoms or health issues persist or worsen, it's essential to contact your doctor for further guidance. To ensure your safety, never share your medication with others or take someone else's medication. Some medications may come with an additional patient information leaflet, so be sure to check with your pharmacist for more information. If you have any questions or concerns about your medication, don't hesitate to reach out to your doctor, nurse, pharmacist, or other healthcare provider. In the event of a suspected overdose, immediately call your local poison control center or seek medical attention. When seeking help, be prepared to provide details about the medication taken, the amount, and the time it happened.