<style>
  .container{
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
  }
  a{
    transform: translate(-50%, -50%);
    border: 1px solid red;
    padding: 20px;
  }

  .toggle-example{
    background-color: red;
  }

</style>
<div class="container">
  <a data-consult-id="1">
    123
  </a>
  <a data-consult-id="2">
    456
  </a>
</div>
<script
  src="https://code.jquery.com/jquery-3.3.1.min.js"
  integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="
  crossorigin="anonymous"></script>
<script>
  let referenciaArmazenada = null;
$(document).on('click', 'a[data-consult-id]', function () {

  $(this).toggleClass('toggle-example');

  if(referenciaArmazenada){
    $(referenciaArmazenada).toggleClass('toggle-example');
  }
  referenciaArmazenada = this;
});
</script>