Injection (medicine)

A shot helps you get well.

It uses a tiny needle and a tool called a syringe. The needle puts liquid medicine into your body. This can work faster than eating medicine.

Some shots go deep into a muscle. Other shots go just under your skin. Some shots go right into a vein. A shot might sting a little bit. A doctor can numb the spot to help. You can be very brave!

An injection is a way to put liquid medicine into the body.

It uses a needle and a tool called a syringe. This method helps medicine work fast. It also helps when a person cannot swallow pills.

There are many ways to give an injection. Some go into a vein. This is called an intravenous injection, or IV. This is the fastest way for medicine to travel through the blood.

Other shots go deep into a muscle. These are called intramuscular injections. Most vaccines are given this way.

Some shots go just under the skin. These are called subcutaneous injections. They use shorter needles. Another type goes into the skin layer. This is an intradermal injection. These are often used for allergy tests.

In emergencies, a needle might go into a bone. This is called an intraosseous injection. It helps when doctors cannot find a vein.

An injection makes a tiny hole in the skin. This might cause a little pain. Doctors can numb the spot to help. They also clean the skin to keep it safe from germs.

An injection is a way to give liquid medicine to a person.

This is done using a needle and a tool called a syringe. People often call these shots, jabs, or jags. This method is called parenteral administration. This means the medicine does not go through the digestive tract. Because of this, the body can absorb the medicine more quickly. It also helps the medicine avoid the first pass effect. This effect happens when the body processes medicine in the digestive system first.

There are many ways to give an injection depending on the goal. An intravenous injection, or IV, goes directly into a vein. This is the fastest way for medicine to reach the whole body. An intramuscular injection, or IM, goes deep into a muscle. These are used for many vaccines, like the influenza shot. A subcutaneous injection, or SC, goes into the fatty tissue under the skin. This uses a shorter needle and works more slowly. An intradermal injection, or ID, goes into the skin layer called the dermis.

These are often used for allergy or sensitivity tests.

Sometimes, doctors must use special methods in hard situations. An intraosseous injection goes into the bone marrow of a large bone. This is used in emergencies when a person's veins are hard to find. This can be done in the humerus or the tibia. Some injections are localized, meaning they only work in one spot. An intra-articular injection goes into a joint to help with pain. An intravitreal injection goes into the eye to treat infections.

These help avoid side effects in the rest of the body.

Injections are a huge part of healthcare around the world. At least 16 billion injections are given each year in developing and transitional countries. About 95% of these are used to treat a condition. Only 3% are used for immunizations or vaccinations. The rest are used for other things, like blood transfusions. Some injections are a bolus, which is a one-time dose. Other injections are depot injections. These are designed to release medicine slowly for a long time.

Using needles requires being very careful to stay safe. An injection makes a small puncture wound in the skin. This can cause some pain or a small infection. To help, doctors can numb the area or use a distraction. They also use an aseptic technique, which means they clean the skin to stop germs.

If needles are reused, there is a risk of spreading diseases like HIV. To prevent this, safety syringes have special features. These features help stop people from accidentally pricking themselves or reusing a needle.

An injection is the process of administering a liquid substance into the body. This is typically done using a needle and a syringe. In medical terms, this is a form of parenteral drug administration. This means the medication does not enter through the digestive tract. Because it bypasses the stomach, the medicine avoids the first pass effect. This effect occurs when the digestive system processes a drug before it reaches the rest of the body. By avoiding this, the medication can be absorbed much more rapidly.

There are several ways to classify injections. They can be grouped by the specific tissue they enter. They can also be classified by the intended location of the effect. Another way to group them is by the duration of the medicine's effect. Most injections provide a bolus, which is a single, one-time dose. However, some are designed as depot injections. A depot injection is a type of medication designed to release slowly over time. This allows for long-lasting effects within the body.

Many injections are systemic, meaning they affect the entire body. These are used when a patient cannot take medicine by mouth. They are also used if a drug would not be absorbed well by the gastrointestinal tract. The most common systemic method is the intravenous injection, or IV. This involves inserting a needle directly into a vein. This delivers the substance straight into the bloodstream. Because there is no delay for absorption, it provides the quickest onset of effects.

Another common method is the intramuscular injection, or IM. This delivers medication deep into a muscle. The blood vessels in the muscle then absorb the substance into systemic circulation. Common sites for these include the deltoid or the vastus lateralis muscles. Most inactivated vaccines, such as the influenza vaccine, are given this way. Subcutaneous injections, or SC, are administered into the fatty tissue under the skin. This method uses thinner, shorter needles. Absorption from subcutaneous tissue is slower than from a muscle. Insulin is a common example of a drug given almost exclusively this way.

Some injections target very specific layers or areas. An intradermal injection, or ID, delivers substance into the dermis. The dermis is the skin layer located above the fat but below the epidermis. The needle is placed at a shallow angle of 5 to 15 degrees. Because absorption is slow, these are mostly used for sensitivity tests. For example, tuberculin skin tests or allergy tests are often done this way.

In emergencies, doctors may use an intraosseous injection. This involves inserting a needle into the bone marrow of a large bone, like the tibia. This is used when a patient's veins are difficult to access.

Injections can also be localized to treat a single part of the body. An intra-articular injection goes directly into a joint space. These can include steroids to reduce inflammation from osteoarthritis. They can also include hyaluronic acid to reduce joint stiffness. Other localized types include intravitreal injections, which go into the vitreous humor of the eye. These treat conditions like macular degeneration. By injecting the eye directly, doctors can increase medicine concentration while avoiding side effects in the rest of the body.

Injections are a massive part of global healthcare. In developing and transitional countries, at least 16 billion injections are given every year. Of these, 95% are used for curative care to treat a specific condition. Only 3% are used for immunizations and vaccinations. The remaining injections are used for other purposes, such as blood transfusions. Because injections cause a puncture wound, safety is very important. Medical professionals use aseptic technique to clean the site and prevent infection.

Safety measures are necessary to prevent the spread of bloodborne diseases. Diseases like HIV and hepatitis can spread if needles are reused. To combat this, safety syringes have features to prevent accidental needlesticks. There are also needle exchange programs and safe injection sites. These programs provide sterile needles to discourage reuse. Used needles should always be placed in a puncture-resistant sharps container. This helps protect both healthcare workers and the public from injury.