Border Free Health

Medical Expert

What Is Rapid Acting Insulin?

Rapid acting Insulin, a kind of analogue insulins, can be administered intravenously or through an insulin pump. They are typically taken just before or immediately after a meal.

As the name suggests, they act very quickly in minimizing high sugar levels after eating. People with type 1 diabetes typically take this insulin. However, there may be times when they can also be prescribed for patients with type 2 diabetes.

Since it is work so quickly, there is a risk of hypoglycemia. This is why utmost care should be observed when taking this prescription drug.

How Does Rapid-acting Insulin Work?

Rapid acting insulin functions are almost similar to natural human insulin.

They act faster than soluble insulin. It is why these drugs are highly effective around mealtimes.

They work by replacing the insulin typically produced by the body. Other than that, rapid-acting insulin also helps regulate blood sugar levels. More importantly, they inhibit the liver from making more sugar which could do more harm than good to your body.

Rapid-acting Insulin names

Currently, there are three brands of rapid-acting insulin available, specifically:


Fiasp and NovoRapid (insulin aspart)

Onset: 15-30 mins

Peak: 30-90 mins

Duration: 3-5 hours


Humalog (insulin lispro)

Onset: 10-20 mins

Peak: 40-50 mins

Duration: 3-5 hours


Apidra (insulin glulisine)

Onset: 20-30 mins

Peak: 30-90 mins

Duration: 1-2.5 hours


After injection, rapid-acting insulin begins to function between 2.5 to 20 minutes. Its effects peak between one and three hours after injection and last up to five hours.

Like the body’s natural insulin, this kind of insulin medicine reacts more rapidly after a meal, lowering the risk of low blood sugar (below 4 mmol/L).  It is important to note that you must eat immediately or shortly after injecting.



Here are the two main types of rapid-acting insulin that you may have already heard of if you are dealing with either type 1 or type 2 diabetes:

Humalog can be taken together with intermediate or longer-acting insulin for a more effective management of your sugar levels.

Novorapid can be combined with other longer-lasting types of insulin. In this manner, you can maintain an average blood sugar level all day.

Share this post:

Sign up for health care tips and news

Receive offers and updates from our team of experts.

Browse Our Experts Advice
Our experts regularly write about ways to improve your health and wellbeing.

Related Products

Related Articles & Advice


insulin overdose symptoms

Insulin overdose symptoms. Proper insulin administration can be a life-saver for someone navigating through diabetes. However, there can be several risks associated it is. Insulin

Read More »

Lispro Insulin Peak

Lispro insulin is a fast-acting insulin drug used for treating hyperglycemia typically caused by Type 1 and Type 2 diabetes. It is prescribed for diabetes mellitus,

Read More »

What is Long-acting Insulin?

Unlike short-acting insulins, long-acting insulins can maintain blood sugar levels all day. We can compare this to how your body produces insulin to help regulate

Read More »

Types Of Insulin Pen

Insulin pens are a convenient, portable way to manage your diabetes and keep blood sugar levels under control. They are small enough to fit in

Read More »

What is Short Acting Insulin?

Short acting Insulin injection is primarily used to treat diabetes among children and adults. It uses human-made insulin to lower blood sugar and manage blood

Read More »

What is Fast-acting Insulin

Fast acting insulin, lowers blood sugar after meals and begins acting within 15 minutes of injection. Some of the advantages of taking fast-acting insulin are:

Read More »

What is Insulin Resistance?

Insulin resistance happens when cells in your muscles, fat, and liver fail to respond to insulin and cannot utilize glucose from your blood and convert

Read More »

What Are The 5 Types Of Insulin?

There are several different types of insulin available to manage diabetes. The right one for you will depend on your health condition. Short-acting, rapid-acting, intermediate-acting,

Read More »
Search NOW

Can't find what you need?

Select Language:

Find Medication

Find Help & Advice

Find Medication

Find Help & Advice


Any site that offers you medication without a prescription or based on a remote consultation will likely be gone tomorrow. With Border Free Health, you are sure to receive generics which are produced by Canada and India’s top rated manufacturers.

It is permitted to buy non controlled substance medication for personal use online. Please read the FDA memo for more information on personal importation of medication.

Generic medication is simply a medication that has been manufactured by a different company, rather than the company who originally held the patent on the product. Generic medications work in the exact same manner as brand name medications and are bio-equivalent to their brand name counterparts. Generic versions of medications cost far less because they invest less money on marketing.

India & Turkey have one of the largest pharmaceutical manufacturing industries in the world! In fact, many of these companies are doing contract manufacturing for the North American market, and therefore their facilities are FDA approved. We source our medications only from the top-rated manufacturers who follow GMP guidelines, and produce their medicine in world-class manufacturing facilities. All of the Indian generic medications we sell are approved by the World Health Organization, Pepfar, and the Indian FDA.

Prescriptions are valid for one year or until the refills authorized have been exhausted.

We can send up to a 90 day supply at one time. Ordering a 90 day supply saves on shipping and allows your to have a larged amount of medicaiton on hand at one time.