{"id":11416969,"date":"2026-10-04T20:38:24","date_gmt":"2026-10-04T17:38:24","guid":{"rendered":"https:\/\/nostylelike.net\/natamycin-side-effects\/"},"modified":"2026-10-04T20:46:51","modified_gmt":"2026-10-04T17:46:51","slug":"natamycin-side-effects","status":"publish","type":"post","link":"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/","title":{"rendered":"Natamycin Side Effects: 6 Common Symptoms and 5 Warning Signs That Need a Doctor"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Natamycin_Side_Effects_What_Is_Normal_and_What_Is_Worrying\" >Natamycin Side Effects: What Is Normal and What Is Worrying?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Why_Are_Most_Natamycin_Side_Effects_Local\" >Why Are Most Natamycin Side Effects Local?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Common_Temporary_Side_Effects\" >Common, Temporary Side Effects<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Less_Common_Natamycin_Side_Effects\" >Less Common Natamycin Side Effects<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Warning_Signs_That_Need_a_Doctor_Immediately\" >Warning Signs That Need a Doctor Immediately<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Allergy_to_the_Ingredients\" >Allergy to the Ingredients<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Contact_Lenses_During_Treatment\" >Contact Lenses During Treatment<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Pregnancy_Breastfeeding_and_Children\" >Pregnancy, Breastfeeding and Children<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Side_Effects_or_Symptoms_of_the_Infection\" >Side Effects or Symptoms of the Infection?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#How_to_Reduce_Natamycin_Side_Effects\" >How to Reduce Natamycin Side Effects<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Is_stinging_when_I_put_the_drop_in_normal\" >Is stinging when I put the drop in normal?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Should_I_stop_the_drops_if_I_feel_irritation\" >Should I stop the drops if I feel irritation?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Does_it_interact_with_my_other_medicines\" >Does it interact with my other medicines?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Where_can_I_read_about_the_medicine_in_general\" >Where can I read about the medicine in general?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/nostylelike.net\/en\/natamycin-side-effects\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"top\"><span class=\"ez-toc-section\" id=\"Natamycin_Side_Effects_What_Is_Normal_and_What_Is_Worrying\"><\/span>Natamycin Side Effects: What Is Normal and What Is Worrying?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If your eye doctor has prescribed natamycin drops, it is natural to wonder about their side effects. Knowing the possible <strong>natamycin side effects<\/strong> helps you tell the difference between a passing sting that is nothing to worry about and warning signs that need a doctor straight away. This article is educational and does not replace asking your doctor about your own case.<\/p>\n<figure style=\"margin: 0 0 18px;\"><img fetchpriority=\"high\" decoding=\"async\" style=\"max-width: 100%; height: auto; border-radius: 10px;\" src=\"https:\/\/nostylelike.net\/wp-content\/uploads\/2026\/10\/nat-article-side-en.jpg\" alt=\"natamycin side effects \u2013 Natamycin Side Effects\" width=\"1200\" height=\"675\" \/><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Why_Are_Most_Natamycin_Side_Effects_Local\"><\/span>Why Are Most Natamycin Side Effects Local?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In the eye, natamycin is used as a topical suspension, and the body absorbs only a tiny amount. As a result, natamycin side effects mostly stay in the eye itself, and whole-body symptoms are rare.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Common_Temporary_Side_Effects\"><\/span>Common, Temporary Side Effects<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Mild stinging or burning when the drop goes in.<\/li>\n<li>Slight eye redness.<\/li>\n<li>Extra tearing.<\/li>\n<li>A feeling that something is in the eye.<\/li>\n<li>Brief blurred vision after use, because of the suspension.<\/li>\n<li>White residue on the lashes or eyelid margin.<\/li>\n<\/ul>\n<p>These usually fade within minutes and do not mean you should stop treatment.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Less_Common_Natamycin_Side_Effects\"><\/span>Less Common Natamycin Side Effects<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Post-marketing reports in the official labelling include eye swelling, eye pain, corneal opacity, tingling and allergic reactions. Very rare cases of chest pain and shortness of breath have also been reported. Seeing these on a list does not mean they will happen to you, but it is important to know them.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Warning_Signs_That_Need_a_Doctor_Immediately\"><\/span>Warning Signs That Need a Doctor Immediately<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li>More pain, redness or discharge despite following treatment.<\/li>\n<li>Persistent or worsening loss of vision.<\/li>\n<li>Swelling of the eyelids or face, or a skin rash.<\/li>\n<li>No improvement after 7\u201310 days of regular use.<\/li>\n<li>Chest pain or difficulty breathing \u2013 this is an emergency.<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"Allergy_to_the_Ingredients\"><\/span>Allergy to the Ingredients<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The drops must not be used by anyone allergic to natamycin or any other ingredient. Some products, such as <a href=\"https:\/\/nostylelike.net\/en\/product\/natamet-eye-drops-5-5ml\/\">Natamet 5% eye drops<\/a>, contain the preservative benzalkonium chloride, which can irritate some people.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Contact_Lenses_During_Treatment\"><\/span>Contact Lenses During Treatment<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Do not wear contact lenses at any point during treatment. Lenses may be the source of infection, and the preservative can be absorbed by soft lenses.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Pregnancy_Breastfeeding_and_Children\"><\/span>Pregnancy, Breastfeeding and Children<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Data on use during pregnancy and breastfeeding are limited, so the doctor will prescribe it only when clearly needed. Safety in children has not been fully established either.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Side_Effects_or_Symptoms_of_the_Infection\"><\/span>Side Effects or Symptoms of the Infection?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Patients sometimes confuse the symptoms of the fungal infection itself with drug side effects. Redness and pain are already present because of the infection. What matters is the overall trend: brief stinging right after a drop usually comes from the medicine, while pain that grows day by day may mean the infection is not responding and needs review.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Reduce_Natamycin_Side_Effects\"><\/span>How to Reduce Natamycin Side Effects<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Shake the bottle well before use.<\/li>\n<li>Do not let the dropper tip touch any surface.<\/li>\n<li>Close the eye for one minute after the drop and press the inner corner.<\/li>\n<li>Discard the bottle one month after opening, or if it turns dark brown.<\/li>\n<li>Do not drive until your vision is clear.<\/li>\n<\/ul>\n<p>Good technique keeps natamycin side effects to a minimum and protects the bottle from contamination.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Is_stinging_when_I_put_the_drop_in_normal\"><\/span>Is stinging when I put the drop in normal?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Usually yes, and it fades within seconds or minutes.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Should_I_stop_the_drops_if_I_feel_irritation\"><\/span>Should I stop the drops if I feel irritation?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If it is mild and passing, no. If it increases or persists, contact your doctor before making any decision.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_it_interact_with_my_other_medicines\"><\/span>Does it interact with my other medicines?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No systemic interactions are known, but wait 5 minutes between different eye drops.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Where_can_I_read_about_the_medicine_in_general\"><\/span>Where can I read about the medicine in general?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>See our guide to <a href=\"https:\/\/nostylelike.net\/en\/natamycin-eye-drops\/\">natamycin eye drops<\/a> and our article on <a href=\"https:\/\/nostylelike.net\/en\/fungal-keratitis\/\">fungal keratitis<\/a>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Most natamycin side effects are local, mild and short-lived, but increasing pain, worsening vision or signs of allergy need a doctor immediately. Follow your eye doctor\u2019s instructions, and if treatment is prescribed you can find <a href=\"https:\/\/nostylelike.net\/en\/product\/natamet-eye-drops-5-5ml\/\">Natamet 5% natamycin eye drops<\/a> at No Style Like pharmacy.<\/p>\n<p style=\"font-size: 0.95em; color: #555; margin-top: 18px;\">This article was reviewed by the No Style Like pharmacy content team. It is purely educational and does not include doses for self-treatment. Natamycin is a prescription medicine used only under the supervision of a specialist eye doctor, not for self-use, and this article does not replace a medical examination.<\/p>\n<p style=\"font-size: 0.95em; color: #555;\">Tell your doctor about any unusual symptom. Never use any eye drop for an undiagnosed red or painful eye, and keep all medicines out of the reach of children. For more information see <a href=\"https:\/\/dailymed.nlm.nih.gov\/dailymed\/drugInfo.cfm?setid=2818fcb8-5bac-41fb-864e-3b598308a428\" target=\"_blank\" rel=\"noopener nofollow\">the official natamycin 5% labelling on DailyMed<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Natamycin side effects from eye drops: common temporary symptoms, serious warning signs, allergy, contact lenses, pregnancy and breastfeeding \u2013 an educational guide.<\/p>\n","protected":false},"author":86,"featured_media":11416967,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42164],"tags":[],"class_list":["post-11416969","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eye-health-vision-care"],"_links":{"self":[{"href":"https:\/\/nostylelike.net\/en\/wp-json\/wp\/v2\/posts\/11416969","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nostylelike.net\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nostylelike.net\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nostylelike.net\/en\/wp-json\/wp\/v2\/users\/86"}],"replies":[{"embeddable":true,"href":"https:\/\/nostylelike.net\/en\/wp-json\/wp\/v2\/comments?post=11416969"}],"version-history":[{"count":1,"href":"https:\/\/nostylelike.net\/en\/wp-json\/wp\/v2\/posts\/11416969\/revisions"}],"predecessor-version":[{"id":11416977,"href":"https:\/\/nostylelike.net\/en\/wp-json\/wp\/v2\/posts\/11416969\/revisions\/11416977"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nostylelike.net\/en\/wp-json\/wp\/v2\/media\/11416967"}],"wp:attachment":[{"href":"https:\/\/nostylelike.net\/en\/wp-json\/wp\/v2\/media?parent=11416969"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nostylelike.net\/en\/wp-json\/wp\/v2\/categories?post=11416969"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nostylelike.net\/en\/wp-json\/wp\/v2\/tags?post=11416969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}