<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019df9bd-2ad2-7e60-9de0-7f4bf5e39917,g:1c077f42-d82c-4d4c-b9f5-aa47d28588ba-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.eltx.com/role/Cover" xlink:type="simple" xlink:href="eltx-20260511.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.eltx.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019df9c6-64e8-73f9-936c-d8eafc21abe8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_DocumentType_019df9c6-64e8-73f9-936c-d8eafc21abe8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019df9c7-5cfa-7b9f-992a-a1a97c34bc37" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_EntityRegistrantName_019df9c7-5cfa-7b9f-992a-a1a97c34bc37" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019df9c9-3b83-7da9-aa78-c7ec7bf6b6a6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019df9c9-3b83-7da9-aa78-c7ec7bf6b6a6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019df9c9-b508-7723-adc0-5c1591069fe9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_EntityFileNumber_019df9c9-b508-7723-adc0-5c1591069fe9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019df9ca-153c-7b07-b9a9-873a00136ba2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_EntityTaxIdentificationNumber_019df9ca-153c-7b07-b9a9-873a00136ba2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019df9ca-d824-71e1-b507-a08d94c2014c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_EntityAddressAddressLine1_019df9ca-d824-71e1-b507-a08d94c2014c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019df9cc-7952-7441-9943-54dce67d6b2b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_EntityAddressPostalZipCode_019df9cc-7952-7441-9943-54dce67d6b2b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019df9cb-f73f-7af0-af20-15ea7bdd01d6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_EntityAddressStateOrProvince_019df9cb-f73f-7af0-af20-15ea7bdd01d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019df9cb-74e6-74e9-95a2-b59d85be83a4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_EntityAddressCityOrTown_019df9cb-74e6-74e9-95a2-b59d85be83a4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019df9cc-ed73-79d6-a70d-04d62aad781a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_CityAreaCode_019df9cc-ed73-79d6-a70d-04d62aad781a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019df9cd-543f-7404-8431-603ad9f4fc38" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_LocalPhoneNumber_019df9cd-543f-7404-8431-603ad9f4fc38" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019df9cf-7722-7ec8-a8bb-f66452228cc8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_EntityEmergingGrowthCompany_019df9cf-7722-7ec8-a8bb-f66452228cc8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019df9d0-1938-7f4f-ba2a-569e5a6903db" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_TradingSymbol_019df9d0-1938-7f4f-ba2a-569e5a6903db" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019df9d0-707f-72b5-9759-5c3a66c26360" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_Security12bTitle_019df9d0-707f-72b5-9759-5c3a66c26360" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019df9d0-d994-7ab9-9d6d-e497d36b3767" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_SecurityExchangeName_019df9d0-d994-7ab9-9d6d-e497d36b3767" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityExTransitionPeriod_019df9d1-7cf0-7f3a-ae5b-b1d62172dbdc" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityExTransitionPeriod"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_EntityExTransitionPeriod_019df9d1-7cf0-7f3a-ae5b-b1d62172dbdc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019df9d2-e7ea-71f4-9f27-37333d42a1c3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_WrittenCommunications_019df9d2-e7ea-71f4-9f27-37333d42a1c3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019df9d3-5f08-75da-a748-6495c6f0db33" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_SolicitingMaterial_019df9d3-5f08-75da-a748-6495c6f0db33" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019df9d3-db0b-7364-b0b1-409ebf699043" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_PreCommencementTenderOffer_019df9d3-db0b-7364-b0b1-409ebf699043" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019df9d4-6a72-759b-8d09-17aee2557924" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019df9d4-6a72-759b-8d09-17aee2557924" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019df9d6-19fa-7615-89b8-c459d180bdd6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_EntityCentralIndexKey_019df9d6-19fa-7615-89b8-c459d180bdd6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019df9d6-698f-7aeb-9979-aa5656aedf4a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_AmendmentFlag_019df9d6-698f-7aeb-9979-aa5656aedf4a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019df9d7-3155-710e-a8c5-67b9775bf06e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019df9c6-64e8-79e6-9b61-4cdb88146776" xlink:to="loc_dei_DocumentPeriodEndDate_019df9d7-3155-710e-a8c5-67b9775bf06e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
