Nasal sprays for COVID: How far has science come

The virus that causes COVID, SARS-CoV-2, is preventable by vaccination. You can treat COVID with medications that you can take at home or at a hospital. Researchers are currently testing a novel idea. Drugs that prevent the virus from ever entering the body are what they are trying to create. This includes nasal sprays that prevent the virus from adhering to nasal passage. Other scientists are investigating the possibility of using nasal sprays to prevent virus replication in the nose or to make the nose a hostile environment for virus entry. Here is the state of science at the moment and what lies ahead.

The concept of "viral blockage," as the name suggests, is based on preventing SARS-CoV-2. To put it another way, if something gets in the way of the virus's ability to connect to a cell and infect you, it cannot do so. Since SARS-CoV-2 is a respiratory virus, it makes sense to administer this medication via a nasal spray, which is how the virus typically enters the body.

Many organisations from around the world are working on this idea. In the lab, some study is still being done. Some drugs have advanced to early human testing. None are currently offered for general usage

Heparin is a widely utilised drug that has been employed to thin the blood for many years. Heparin is safe and effective in blocking the virus from attaching to nasal cells, according to studies conducted on mice. Heparin, according to researchers, attaches to the virus itself and prevents it from adhering to the cells it is attempting to infect. Ethyl lauroyl arginine hydrochloride, also known as Covixyl-V, is another nasal spray in development. By inhibiting or altering the cell surface, it seeks to stop COVID from spreading and infecting new cells.

Making nasal sprays that prevent the virus from reproducing in the nose is another strategy. Genetic pieces that bind to the viral RNA are being created by researchers. These pieces, often referred to as "locked nucleic acid antisense oligonucleotides" (LNA ASOs) throw a spanner in the works and prevent the virus from multiplying. These genetic snippets were sprayed into small animals' noses to limit virus proliferation there and stop sickness.

Making the environment in the nose less conducive to the virus is a third tactic. That could be done by using a nasal spray to add a virus-killing substance, adjust the pH (by adding more acid or alkaline to the nose), or change the moisture levels (by adding saline) (iodine). Through simple virus removal, saline can reduce the amount of SARS-CoV-2 in the nose. Saline nasal irrigation has even been shown in one study to lower the severity of COVID disease. But more study on saline sprays is necessary. An iodine-based nasal spray was found to lower the viral load in the nose.

One of the main obstacles to using nasal sprays for COVID, despite encouraging data so far, is maintaining the sprays in the nose. Most sprays require many applications per day, sometimes every few hours, to combat this. Therefore, based on what we currently know, nasal sprays won't completely defeat COVID. But if they pass regulatory scrutiny and are found to be safe and successful in human trials, they could be yet another tool in the fight against it.

Also Read: Recovered from COVID? These telltale signs reveal your lungs aren't as healthy now