diff --git a/docs/SymptomsCausedByDrugs/index.html b/docs/SymptomsCausedByDrugs/index.html
index adbef9bff16..30ef302ac64 100644
--- a/docs/SymptomsCausedByDrugs/index.html
+++ b/docs/SymptomsCausedByDrugs/index.html
@@ -47,6 +47,7 @@
             symptom: {
               symptomSelectElement: $('#symptomSelect'),
               selectSymptom: UIUtils.getSearchParam(urlSearchParams, 'symptom', null),
+              onSymptomSelected: symptom => UIUtils.setSearchParamOfCurrentUrl('symptom', symptom),
               prrByVaccineTableElement: $('#prrByVaccineTable'),
               downloadPrrByVaccineTableButton: document.querySelector("#downloadPrrByVaccineTable"),
               keyColumnName: name
@@ -54,6 +55,7 @@
             vaccine: {
               vaccineSelectElement: $('#vaccineSelect'),
               selectVaccine: UIUtils.getSearchParam(urlSearchParams, 'vaccine', null),
+              onVaccineSelected: vaccine => UIUtils.setSearchParamOfCurrentUrl('vaccine', vaccine),
               prrBySymptomTableElement: $('#prrBySymptomTable'),
               downloadPrrBySymptomTableButton: document.querySelector("#downloadPrrBySymptomTable"),
               valueName: name
diff --git a/docs/SymptomsCausedByDrugs/js/PageInitializer.js b/docs/SymptomsCausedByDrugs/js/PageInitializer.js
index 033e486ae19..e4a1ee846a2 100644
--- a/docs/SymptomsCausedByDrugs/js/PageInitializer.js
+++ b/docs/SymptomsCausedByDrugs/js/PageInitializer.js
@@ -5,7 +5,7 @@ class PageInitializer {
         PageInitializer.#configureVaccine(vaccine);
     }
 
-    static #configureSymptom({ symptomSelectElement, selectSymptom, prrByVaccineTableElement, downloadPrrByVaccineTableButton, keyColumnName }) {
+    static #configureSymptom({ symptomSelectElement, selectSymptom, onSymptomSelected, prrByVaccineTableElement, downloadPrrByVaccineTableButton, keyColumnName }) {
         const prrByVaccineTableView = new PrrByVaccineTableView(prrByVaccineTableElement, downloadPrrByVaccineTableButton, keyColumnName);
         Select2.initializeSelectElement(
             {
@@ -13,15 +13,13 @@ class PageInitializer {
                 textOfOption2Select: selectSymptom,
                 onValueSelected: (id, text) => {
                     prrByVaccineTableView.displayPrrByVaccineTable4Symptom(id, text);
-                    const url = new URL(window.location.href);
-                    url.searchParams.set('symptom', text);
-                    window.history.replaceState(null, "", url);
+                    onSymptomSelected(text);
                 },
                 minimumInputLength: 0
             });
     }
 
-    static #configureVaccine({ vaccineSelectElement, selectVaccine, prrBySymptomTableElement, downloadPrrBySymptomTableButton, valueName }) {
+    static #configureVaccine({ vaccineSelectElement, selectVaccine, onVaccineSelected, prrBySymptomTableElement, downloadPrrBySymptomTableButton, valueName }) {
         const prrBySymptomTableView = new PrrBySymptomTableView(prrBySymptomTableElement, downloadPrrBySymptomTableButton, valueName);
         Select2.initializeSelectElement(
             {
@@ -29,9 +27,7 @@ class PageInitializer {
                 textOfOption2Select: selectVaccine,
                 onValueSelected: (id, text) => {
                     prrBySymptomTableView.displayPrrBySymptomTable4Vaccine(id, text);
-                    const url = new URL(window.location.href);
-                    url.searchParams.set('vaccine', text);
-                    window.history.replaceState(null, "", url);
+                    onVaccineSelected(text);
                 },
                 minimumInputLength: 0
             });
diff --git a/docs/UIUtils.js b/docs/UIUtils.js
index 6aae5dc2c68..530604b8159 100644
--- a/docs/UIUtils.js
+++ b/docs/UIUtils.js
@@ -38,6 +38,12 @@ class UIUtils {
         return UIUtils.getSearchParam(urlParams, searchParam, 'NO').toUpperCase() == 'YES';
     }
 
+    static setSearchParamOfCurrentUrl(nameOfSearchParam, valueOfSearchParam) {
+        const url = new URL(window.location.href);
+        url.searchParams.set(nameOfSearchParam, valueOfSearchParam);
+        window.history.replaceState(null, "", url);
+    }
+
     static downloadUrlAsFilename(url, filename) {
         const a = document.createElement('a');
         a.setAttribute('href', url);