As with any medicine, the effect of injections also reduces with time. Therefore multiple treatments are usually required. There are two main categories of injections
1. Steroids: which have an effect for about 12 weeks.
2. AntiVEGFs: effect lasts for only 4 weeks.
Both injections have their pros and cons. The doctor usually takes into consideration all the factors and decides what's best for you. It is important to maintain good control of sugar during the treatment as these procedures cannot be done if sugars are high. Also, the injections will not be effective if one doesn't control sugars.