insulin human/insulin isophane
Brand names: Humulin 70/30
Humulin 70/30 is a mix of two types of insulin. It helps control blood sugar in adults with diabetes.
What it does
Humulin 70/30 is used to improve blood sugar control in adults with diabetes.
Common side effects
Low blood sugar (hypoglycemia), Allergic reactions like redness and swelling at the injection site, Skin changes at the injection site
Key warnings
Never share a Humulin 70/30 KwikPen or syringe with anyone else, even if the needle is changed.
How It Works
This medicine is a mix of two insulins: one that works quickly and one that works longer. The short-acting insulin helps control blood sugar after meals. The intermediate-acting insulin works between meals and during the night.
How to Take It
Inject Humulin 70/30 under your skin (subcutaneously). You can inject it in your belly area, thigh, upper arm, or buttocks. Inject it 30 to 45 minutes before you eat a meal. Do not inject into areas with skin depressions or thickening.
Pregnancy & Breastfeeding
Tell your doctor if you are pregnant or plan to become pregnant. Good control of diabetes is important during pregnancy. This medicine may pass into breast milk, but it is not expected to harm your baby.
Missed Dose
If you miss a dose, check your blood sugar and take your next dose as scheduled. Do not take a double dose to make up for a missed dose.
Storage
Keep Humulin 70/30 in its original carton, away from heat and light. Do not freeze it.
Side Effects (from patient reports)
Based on 27,609 FDA adverse event reports.
Serious Warnings
Never share a Humulin 70/30 KwikPen or syringe with anyone else, even if the needle is changed. Sharing pens or syringes can spread blood-borne diseases. Changes in your insulin dose should be done carefully with your doctor's supervision. Low blood sugar can be life-threatening. Fluid retention and heart failure can occur if you also take thiazolidinediones (TZDs).
Known Drug Interactions
7 DRUG INTERACTIONS Table 1: Clinically Significant Drug Interactions with HUMULIN 70/30 Drugs that May Increase the Risk of Hypoglycemia Drugs: Antidiabetic agents, ACE inhibitors, angiotensin II receptor blocking agents, disopyramide, fibrates, fluoxetine, monoamine oxidase inhibitors, pentoxifylline, pramlintide, salicylates, somatostatin analog (e.g., octreotide), and sulfonamide antibiotics Intervention: Dose adjustment and increased frequency of glucose monitoring may be required when HUMULIN 70/30 is co-administered with these drugs.
Mechanism: Fluoxetine can increase the risk of low blood sugar when taken with insulin.
What to do: Your doctor may need to adjust your dose and you should check your blood sugar levels more frequently.
7 DRUG INTERACTIONS Table 1: Clinically Significant Drug Interactions with HUMULIN 70/30 Drugs that May Increase the Risk of Hypoglycemia Drugs: Antidiabetic agents, ACE inhibitors, angiotensin II receptor blocking agents, disopyramide, fibrates, fluoxetine, monoamine oxidase inhibitors, pentoxifylline, pramlintide, salicylates, somatostatin analog (e.g., octreotide), and sulfonamide antibiotics Intervention: Dose adjustment and increased frequency of glucose monitoring may be required when HUMULIN 70/30 is co-administered with these drugs.
Mechanism: Pramlintide can increase the risk of low blood sugar when taken with insulin.
What to do: Your doctor may need to adjust your dose and you should check your blood sugar levels more frequently.
7 DRUG INTERACTIONS Table 1: Clinically Significant Drug Interactions with HUMULIN 70/30 Drugs that May Increase the Risk of Hypoglycemia Drugs: Antidiabetic agents, ACE inhibitors, angiotensin II receptor blocking agents, disopyramide, fibrates, fluoxetine, monoamine oxidase inhibitors, pentoxifylline, pramlintide, salicylates, somatostatin analog (e.g., octreotide), and sulfonamide antibiotics Intervention: Dose adjustment and increased frequency of glucose monitoring may be required when HUMULIN 70/30 is co-administered with these drugs.
Mechanism: Octreotide can lower blood sugar levels, which adds to the effect of insulin and makes low blood sugar more likely.
What to do: Your doctor may need to adjust your insulin dose and you should check your blood sugar more often.
Drugs that May Decrease the Blood Glucose Lowering Effect of HUMULIN 70/30 Drugs: Atypical antipsychotics (e.g., olanzapine and clozapine), corticosteroids, danazol, diuretics, estrogens, glucagon, isoniazid, niacin, oral contraceptives, phenothiazines, progestogens (e.g., in oral contraceptives), protease inhibitors, somatropin, sympathomimetic agents (e.g., albuterol, epinephrine, terbutaline), and thyroid hormones.
Mechanism: Albuterol can cause the liver to release more sugar into the blood, which reduces the effectiveness of your insulin.
What to do: Keep a close eye on your blood sugar levels and talk to your doctor about adjusting your insulin dose.
Drugs that May Increase or Decrease the Blood Glucose Lowering Effect of HUMULIN 70/30 Drugs: Alcohol, beta-blockers, clonidine, and lithium salts. Drugs that May Blunt Signs and Symptoms of Hypoglycemia Drugs: Beta-blockers, clonidine, guanethidine, and reserpine Intervention: Increased frequency of glucose monitoring may be required when HUMULIN 70/30 is co-administered with these drugs. ( 7 ) Antiadrenergic Drugs (e.g., beta-blockers, clonidine, guanethidine, and reserpine): Signs and symptoms of hypoglycemia may be reduced or absent.
Mechanism: Clonidine can change how well insulin works and hide the normal warning signs of low blood sugar, such as a fast heartbeat.
What to do: You should check your blood sugar levels more often when taking these two medicines together.
Common Questions
What should the medicine look like?
Can I mix Humulin 70/30 with other insulins?
How often should I check my blood sugar?
What happens if I inject into the same spot every time?
What should I do if my blood sugar is too low?
Can other medicines affect Humulin 70/30?
How long can I use a Humulin 70/30 vial once it is opened?
How long can I use a Humulin 70/30 KwikPen once it is opened?
What are the signs of low blood sugar?
What are the signs of high blood sugar?
What are the common side effects of insulin human/insulin isophane?
Does insulin human/insulin isophane interact with other medications?
What drug class is insulin human/insulin isophane?
Is insulin human/insulin isophane safe during pregnancy?
Related Medications in Intermediate-Acting Insulin Combination
Other drugs grouped near insulin human/insulin isophane — same-class peers and common alternatives.
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bromocriptine
Cycloset
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canagliflozin
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colesevelam
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Colesevelam is a medicine that helps lower bad cholesterol (LDL-C) and control blood sugar in adults.
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What the FDA Data Shows for insulin human/insulin isophane
The FDA label for insulin human/insulin isophane (sold under brand names such as Humulin 70/30) classifies it as a prescription-only medication in the Intermediate-Acting Insulin Combination class. Humulin 70/30 is used to improve blood sugar control in adults with diabetes. Official labeling lists 4 commonly reported side effects, including Low blood sugar (hypoglycemia), Allergic reactions like redness and swelling at the injection site, Skin changes at the injection site.
Post-market surveillance from the FDA Adverse Event Reporting System (FAERS) captures real-world experience. For this drug, FAERS contains 27,609 voluntary reports. The database also lists 11 documented drug interactions derived from FDA labeling, with the top-flagged interaction rated moderate severity. Acquisition-cost data is surveyed weekly by CMS and updated as manufacturers report changes.
Report counts do not establish causation — a FAERS entry documents a temporal association, not proof that the drug produced the outcome. Widely prescribed medications naturally accumulate more reports than niche therapies, so raw totals must be interpreted alongside total exposure. Shortage status, recall history, and patent information further shape supply and switching decisions. This page summarizes public FDA data for educational purposes only and is not a substitute for professional medical advice — always consult a licensed healthcare provider before starting, stopping, or changing any medication.
Data Sources
Drug labeling: FDA Drug Labels (SPL/DailyMed). Adverse events: FDA Adverse Event Reporting System (FAERS).
FAERS reports are voluntary and do not establish causation. Drug interactions are derived from FDA labeling and clinical references. Always consult a healthcare professional before making medication decisions.
Last updated: December 10, 2024
Read our methodology — how this data is sourced, computed, and verified.
All federal data sources used on this page
- FDA Orange Book — approved drug products with therapeutic equivalence. accessdata.fda.gov/cder/ob
- FDA DailyMed — NIH-hosted drug labeling for FDA-approved meds. dailymed.nlm.nih.gov
- FDA Adverse Event Reporting System (FAERS) — post-marketing safety surveillance. fda.gov/drugs/faers
- NLM RxNorm — standardized clinical drug nomenclature. nlm.nih.gov/research/umls/rxnorm
- CMS Medicare Part B Drug Average Sales Price Files — federal drug pricing data. cms.gov/medicare/part-b-drugs/asp
- FDA Drug Shortages Database — current and resolved drug shortage tracking. accessdata.fda.gov/drugshortages