Managing Aciclovir Side Effects: Quick Reference Guide

Aciclovir is generally well-tolerated, but like all medicines, it can cause side effects in some people. Most side effects are mild and temporary, occurring more commonly with tablet forms than topical creams. Understanding what to expect and how to manage potential side effects can help you feel more confident about your cold sore treatment. If you experience any concerning symptoms, consult your pharmacist or GP promptly for guidance.

  • Most side effects are mild and resolve without treatment
  • Nausea and headaches are the most common reactions
  • Taking tablets with food may reduce stomach upset
  • Serious allergic reactions are rare but require immediate medical attention
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Choose from a wide range of clinically-proven, safe, and effective treatments for Cold Sore.

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Aciclovir Tablets

From £12.99

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Aciclovir 5% Cream

From £8.99

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Valaciclovir

From £18.99

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Valtrex

From £34.99

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Common Side Effects and Management Strategies

Most Common Side Effects (Affecting 1-10% of Users)

The most frequently reported side effects with aciclovir tablets include nausea, headache, dizziness, and stomach upset. These symptoms are typically mild and often improve as your body adjusts to the medication. Taking aciclovir with food or milk can help reduce nausea and stomach discomfort. Stay well-hydrated throughout your treatment course, as this may help minimise headaches and support your body's healing process.

Less Common but Notable Reactions

Some users may experience fatigue, skin rash, or diarrhoea whilst taking aciclovir. Hair loss has been reported rarely with prolonged use, though this typically reverses after stopping treatment. If you develop a widespread rash, itching, or any breathing difficulties, discontinue use and seek immediate medical advice, as these could indicate an allergic reaction.

Managing Side Effects Effectively

To minimise potential side effects, take aciclovir exactly as prescribed and complete the full course even if symptoms improve. Avoid alcohol during treatment as this may worsen nausea or dizziness. If side effects persist or become troublesome, consult your pharmacist before stopping treatment. They can advise whether adjusting the timing of doses or taking with food might help.

When to Seek Medical Advice

Contact your GP or pharmacist if you experience severe or persistent side effects, signs of kidney problems (changes in urination, swelling), or neurological symptoms like confusion or tremors. EverydayMeds offers various cold sore treatments including aciclovir tablets and alternative options like valaciclovir, allowing healthcare providers to find the most suitable treatment for your needs.

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