Some drugs will also cause eyes to become red or bloodshot. These include: Marijuana Cocaine or crack Anti-anxiety medications Depressants such as Xanax or other sedatives

Red eyes, also known as “bloodshot eyes”, can be a side effect of drug use. Meth, for example, often prevents people from sleeping, which can result in red eyes. Additionally, using marijuana can cause red eyes, because cannabinoids widen blood vessels and increase blood flow to the eyeballs.

An eye doctor can give or prescribe lubricating eyedrops to soothe the irritation and redness. They also may prescribe a nonsteroidal anti-inflammatory drug (or NSAID), such as ibuprofen. It can come in pill form or as a cream you apply to your eyes.

The red-eye effect is primarily attributed to one of the active compounds in marijuana called delta-9-tetrahydrocannabinol (THC). Unlike CBD, often used in foodstuff and drinks available in almost every British supermarket, THC is a psychoactive component that interacts with cannabinoid receptors in the body, including those in the eyes.

Naphazoline, which is found in drugs such as Clear Eyes Itchy Eye Relief. Naphazoline is a decongestant that can treat redness caused by allergic reactions and minor irritation. Products containing naphazoline are available for purchase online. Tetrahydrozoline, which is found in drops such as Visine.