Use of anti-VEGF drugs at the Instituto de la Visión de Montemorelos

Treatment regimes in adults Regardless of the treatment indication, there are essentially two regimes for administering anti-VEGF drugs: continuous and intermittent/as required (or pro re nata, PRN for short). Most of the initial trials were done as a continuous regime, with regular monthly injections over the course of 2 years, i.e. patients would have 24 injections in total. These trials showed that treatment delivered in this way was effective, but it is also expensive and inconvenient for both the patient and the health care provider. A number of other trials have examined PRN regimes. These are all fairly similar and consist of three injections given over 3 months, followed by review. At this point the patient may: