This product is out of stock.

Cymex Ultra Aciclovir 5% Cream - 2g

Out of stock
Checked for Accuracy by James O'Loan . CEO & Prescribing Pharmacist . on 20/09/2021

What is Cymex Ultra?

Cymex Ultra is a treatment cream which is clinically proven to relieve cold sores and their symptoms. It eases itching and tingling sensations around the cold sore and is designed to be used as soon as symptoms show up. It’s perfect for all the family, keeping those irritating cold sores at bay.


What are cold sores?

Cold sores are small, fluid-filled blisters which typically appear around your mouth but can show up anywhere on your face. When you’re getting a cold sore, you will normally notice an itchy or tingly feeling before the blisters begin to form. Cold sores are caused by a highly contagious virus which lives in your skin. When you have this virus, your cold sores can flare up at any time, leaving you looking for a way to ease irritation.


How will this product treat my cold sores?

Cymex Ultra contains the active ingredient Aciclovir, which is an antiviral agent. This means that it tackles the virus that causes cold sores, helping to speed up healing while relieving symptoms of itching and tingling in the affected area.


How to use Cymex Ultra.

Apply as soon as you notice the first signs of a cold sore, for example, tingling or itching. Apply Cymex Ultra liberally to the affected area 5 times every day. Continue treatment for 4 days, if your cold sore hasn’t healed within this time you can continue to use Cymex Ultra for up to 10 days. Always wash your hands before and after using this product, avoid touching your eyes until you have washed your hands after using Cymex Ultra.


When should Cymex Ultra not be used?

Do not use Cymex Ultra if you are allergic to Aciclovir, valaciclovir, propylene glycol, or any of the other listed ingredients. This product is for external use only, avoid contact with:

  • Eyes
  • Genital area
  • Inside of mouth
  • Inside of nose
  • Any skin infection other than a cold sore


Does Cymex Ultra have side effects?

Like all medicines, Cymex Ultra can have side effects, although not everyone will get them. These side effects include:

  • Allergic reaction, such as swelling of lips, face, or eyelids.
  • Mild burning or stinking in area of application.
  • Redness.
  • Itching.
  • Mild drying or flaking of skin.
  • Skin rashes.
  • Hives.
  • Weals.

If you experience these or any other side effects while using Cymex Ultra, stop using this product and speak to your doctor or Chemist 4 U pharmacist right away.


Important Information

This product is a medicine; make sure to speak to your doctor or Chemist-4-U pharmacist before taking this product if you have an underlying medical problem or are taking any other medicine or complementary therapy. If your symptoms get worse or continue after taking this product, contact us or your doctor. For medical services in your area, please refer to

If you are pregnant, trying to become pregnant, or breastfeeding, speak to your doctor or our pharmacist before taking this product. If you suffer from any allergies, ask your doctor or our pharmacist if this medicine is right for you.

Store all medicines out of sight and reach of children.

Please read the included leaflet carefully before using this product.

Please contact your GP if appropriate regarding this product.


Written on: 18/06/2018

Next review: 17/06/2020

Written by: LH

Active Ingredients

  • Aciclovir
Product Data
Active Ingredient(s)

Ask a Pharmacist

Didn't find the answer you were looking for? Submit a private question to be answered by one of our qualified UK pharmacists.

* Name and email address are only captured so you can be emailed a response when your question is answered by a pharmacist. No personally identifiable information is stored or displayed at any time.

No reviews found

Shipping Costs

Free UK Delivery on all orders over £30* - Delivery within 3-5 working days.

Standard UK Delivery - £2.95* - Delivery within 3-5 working days.

Express UK Delivery - £4.95** - Delivery within 1-2 working days.

Temperature Controlled Delivery - £8.85 - Delivery within 1-3 working days.

Please Note: These prices are shown as a guide only. All delivery times are approximate but have been obtained in good faith.

*Excluding refrigerated products and treatments which are subject to different postage charges.


Discreet Delivery

All our items are sent completely discreet for your peace of mind.

This means the packaging is plain, there is no mention of what product is inside your package and there is no mention of Chemist4U either.

We respect that many of our products are of a sensitive nature - this is why we take every step to keep your purchases private.

Returns Information

Customers can read our full returns policy by clicking here