Skip to main content
Submitted by Dr S. Patel on 9 December 2017

In the second part of the series on drug interactions that persons with diabetes should watch out for, we talk of which medicines increase or decrease your blood glucose level and what you should watch out for.

Often persons with diabetes are on medications other than the diabetes drugs (oral or injectable). They may be on some medications for life for chronic conditions (such as thyroid, mental disorders etc) or acute conditions (such as allergies, infections etc). Drug interactions are known to occur between 2 sets of drugs. For such  patients, such interacts can be crucial as they can tamper the blood glucose levels. The specific pathway behind such mechanisms may not be fully known, but it is hypothesized that certain drugs cause a decrease in peripheral insulin sensitivity, increase the gluconeogenesis or decrease insulin secretion from the β cells of the pancreas. Concurrently, if the glucose levels seem uncontrollable, it would be wise to investigate whether a simultaneous or new medicine is responsible for it.

Let’s look at medications that are known to affect blood sugar levels.

Medicines that may raise blood glucose levels:

DRUG MECHANISM NOTE
Corticosteroids Opposes insulin action. Inhaled and topical steroids have a lower risk of affecting blood glucose than oral agents.
Diuretics (esp Thiazides) Opposes insulin action. Effects depend on dose and duration of use.
Atypical & Typical antipsychotics Insulin resistance, weight gain, diabetic ketoacidosis. Switching to low risk anti-psychotics is helpful.
Niacin/Nicotinic acid Opposes insulin action. Seen when doses > 2-3 mg/day used.
Oral contraceptives Opposes insulin action.  
Nifedipine (calcium channel blockers) Opposes insulin action. Lower dose & monitoring is helpful.
Phenytoin    
Clonidine Inhibits insulin secretion. Is effective in treatment of diabetic diarrhea and neuropathy.
Sugary syrups/lozenges (cough/cold/gastrointestinal medicines) Contain sugar alcohols or sweeteners. Check ingredients before purchase. Opt for sugar-free alternatives.
Fluroquinolone antibiotics Lowers magnesium levels --> Insulin resistence. Magnesium supplementation may be helpful.

Medicines that may lower blood glucose levels:

DRUG MECHANISM NOTE
Ace Inhibitors Increases insulin action. Appears to reduce risk of diabetic neuropathy.
MAO inhibitors Increases insulin signaling. Anti-depressants.
Fibrates Unclear. Used to lower triglyceride/cholesterol levels.
Quinine Increases insulin secretion. Malaria medication.
Salicylates Increases insulin secretion via prostaglandin synthesis inhibition. Is an analgesic and antipyretic!
Alcohol Inhibits hepatic glucose production and release.  
Beta-blockers Increases insulin action. Can also cause hyperglycemia!
Haloperidol (typical antipsychotic) Affects glucose tolerance. Used mostly in schizophrenia.
Pentamidine Early insulin release. Used in serious lung infection called PCP.

The drugs listed in the tables above, is not a complete list but mentions commonly used drugs. It is thus imperative to consult with your doctor before making any changes in your medications, whether it is taking a new drug, increasing dosage or stopping a drug.

Even non-prescription drugs such as cough syrups and alcohol can cause adverse/serious consequences. Checking with your doctor will avoid any drastic or unwanted changes in blood sugar levels and additionally help your doctor conclude if any blood glucose level fluctuation is due to potential drug interactions. All diabetes drugs have the potential to interact with other medications and if this results in hyper or hypoglycemia, it is a serious matter of concern. Such interactions can not only affect the efficacy of the diabetes drugs but also aggravate their side-effects.

Related Reading:
Diabetes Medicines and Drug Interactions with Other Medicines

Sick Day Management

Summary:

Consult your doctor before any changes in medications.
Beware of such interactions and monitor sugar levels regularly. 
Please contact your doctor for any adverse reaction or unexpected symptoms.

References:

  1. Which medications can worsen glycemic control?. Endocrine Today, March 2009. June Felice Johnson, BS, PharmD, FASHP, CMD-diabetes.
  2. https://www.healio.com/endocrinology/diabetes/news/print/endocrine-today/%7B5b64b6a4-1cfa-4fc5-b916-e8284a7945aa%7D/drug-interactions-with-diabetes
  3. Drug interactions with oral hypoglycaemic drugs. Gillian M. Shenfield. Aust Prescr 2001;24:83-51 Jul 2001 DOI: 10.18773/austprescr.2001.094
Community
Condition
Changed
Wed, 12/01/2021 - 20:29

Stories

  • Neighbourhoods That Encourage Walking Reduce Obesity and Diabetes
    People who live in neighborhoods that are conducive to walking experienced a substantially lower rate of obesity, overweight and diabetes than those who lived in more auto-dependent neighborhoods, according to a pair of studies presented at the American Diabetes Association's 74th Scientific Sessions. http://www.diabetescare.net/article/title/neighborboods-that-encourage-walking-reduce-obesity-and-diabetes   Those who read this, also read one of our contributor's journey as a diabetic for…
  • Highest number of diabetes-linked TB cases (302,000) in India, says Lancet
    Diabetes is making an increasingly important contribution to the TB epidemic and a 52% increase in diabetes prevalence recorded over the last 3 years in the 22 highest TB burden countries is thought to be responsible for a rise in diabetes-associated TB cases from 10% in 2010 to 15% in 2013,” says the Lancet study to be published in the medical journal this week. Read more here  Diabetes has long been known to be a risk factor for active tuberculosis and reactivation of latent tuberculosis…
  • Healthy Foods and Treats in Singapore
    Juliana Lim has had Type II diabetes for 27 years. Here, she shares her diabetes and cholesterol friendly secrets and her little treats. She is a committee member of Diabetic Society of Singapore and represents the Diabetic Support Group.  Food - Try to include the following in your daily diet: 1. Small black fungus -These are easily available in supermarkets and can definitely help to manage your blood sugar. 2. Ladies fingers (Okra) - Try to get the fresher ones.…
  • Research Tie up for Diabetes Nephropathy
    AstraZeneca and Mitsubishi Tanabe Pharma said on Wednesday they said signed a three-year research collaboration into diabetic nephropathy, or kidney failure due to diabetes. http://news.yahoo.com/astrazeneca-mitsubishi-tanabe-diabetes-research-064428458--finance.html
  • Delhi schools lead fight against diabetes
    A number of schools in Delhi will be among the first in India to receive information and training on how to educate teachers, students and parents on diabetes (type 1 and type 2). A joint initiative by the Public Health Foundation of India (PHFI), HRIDAY (Health Related Information Dissemination Amongst Youth), the International Diabetes Federation (IDF) and Sanofi India Limited, the KiDS (Kids and Diabetes in Schools) 'School Diabetes Information Pack' was released last week in Delhi. …
  • The Sweet Truth
    All you need to know about artificial sweeteners and sugar-free treats. By Dr Gita Mathai, a paediatrician and family practitioner.  Food is enjoyed if it looks, smells and tastes good. It needs to provide an appetising blend of salt, sugar, bitters, sourness and spice. The first three in excess are “injurious to health”, and, of these, sugar is considered the greatest villain of all. It is purported to be singlehandedly responsible for the global epidemic of…
  • Diabetic kids in school
    Parents of diabetic kids need to communicate with the school teachers so that the teachers can take extra care http://timesofindia.indiatimes.com/City/Chennai/Diabetic-kids-need-extra-care-at-school-say-doctors/articleshow/39197728.cms
  • What your body may be trying to tell you
    Abnormally dry skin? Change in hair colour or shape of your nails? Even simple changes in the body may signify an underlying problem that you need to get checked out. By Dr Gita Mathai, paediatrician and family practitioner, shares tips to help you stay vigilant. The Skin should be a healthy colour.  • If it turns yellow, you may have jaundice.  • If it looks pale, get checked for anaemia. Here's how to manage iron-deficient anaemia. • Excessively cracked and…
  • Number of diabetic women on the rise
    "In Tamil Nadu, it was found that 2,66,661 women above the age of 30 years were diabetic,," the health minister said. Terming diabetes as a killer disease, he recommended that people should exercise more regularly. http://timesofindia.indiatimes.com/City/Trichy/Number-of-women-affected-by-diabetes-on-the-rise/articleshow/38768515.cms
  • FDA Approves Inhaled Insulin Afrezza for Diabetes
    The US Food and Drug Administration (FDA) has approved the inhaled human insulin product Afrezza (MannKind Corp) to improve glycemic control in adults with type 1 and type 2 diabetes. Afrezza is a rapid-acting inhaled insulin to be administered prior to meals or within 20 minutes of starting a meal. It is not a substitute for long-acting insulin, and must be used in combination with long-acting insulin in patients with type 1 diabetes. It is not recommended for the treatment of…