Yes — you can generally travel with aciclovir on a flight from the UK to Poland. Aciclovir is a non-controlled antiviral medicine that is widely used across Europe, so for most adults travelling with a personal supply, keeping the tablets in their original packaging with the patient information leaflet is usually enough. If you use or are considering aciclovir 400mg for herpes simplex or shingles caused by varicella zoster virus, this guide explains what the tablets are used for, how they work, typical dosing, how to buy them online through a UK pharmacy, and the key rules and practical points for flying and travelling with them from the UK.
That matters if you want to avoid treatment gaps, airport confusion, or problems carrying prescription medicine abroad. None of this replaces your prescriber's own instructions. Always follow the dose and course length on your medicine label or patient information leaflet, and speak to a pharmacist or prescriber if anything here differs from what you have been told.
What Is Aciclovir Used For and How Does It Work?
Aciclovir is an antiviral medicine that works against the herpes simplex virus, which causes cold sores and genital herpes, and the varicella zoster virus, which causes chickenpox and shingles. It is used to treat cold sores and treat genital herpes, and it can also treat shingles and treat chickenpox in appropriate cases.
Aciclovir is available in different strengths, and the appropriate strength and dosing schedule depend on the infection being treated and the individual's circumstances. A 400mg tablet may be used in several treatment and suppressive regimens, but it should not be selected or substituted based on tablet strength alone. Cold sores may be treated with topical aciclovir, oral antiviral treatment or other appropriate options, depending on the clinical circumstances.
Aciclovir works by reducing the virus's ability to multiply. As an antiviral medication used to treat viral infections such as herpes infections, it helps limit how much the virus can replicate. It does not cure the underlying infection, since the herpes virus lies dormant in the body between outbreaks, but it can shorten outbreaks, ease symptoms, and, in some circumstances, reduce how often outbreaks occur. Results vary between individuals.
How Long Does Aciclovir Take to Work?
Aciclovir is most effective when started as early as possible, ideally at the first tingling, itching or burning sensation that often signals an outbreak is starting, because aciclovir begins acting against the virus after treatment starts and is generally most effective when started as early as possible after symptoms appear.
Many people notice some improvement within a couple of days of starting treatment, and early action can help treat outbreaks and may be especially helpful for recurrent outbreaks. Completing the full course your prescriber has set, and taking aciclovir tablets exactly as prescribed during outbreak treatment rather than stopping once symptoms ease, gives the best chance of the treatment working as intended.
How Is Aciclovir Usually Taken?
Aciclovir tablets are prescribed in different patterns depending on what is being treated. The table below sets out the general licensed approach as background information only. Your own prescriber will confirm the specific dose, frequency and course length that applies to you, and this may differ from the general pattern for good clinical reasons, because aciclovir dosage and aciclovir doses vary by condition. In the UK, oral aciclovir tablets are prescription-only medicines.
| Situation (general information only) | Typical licensed pattern |
|---|---|
| Herpes Simplex treatment | 200mg five times daily, approximately every four hours while awake, usually for 5 days |
| Suppressive treatment for recurrent herpes simplex | 400mg twice a day, may be used under prescriber guidance |
| Shingles or chickenpox | 800mg five times daily in adults, with the duration depending on the infection and clinical circumstances. |
Aciclovir tablets can be taken with or without food. If you find they upset your stomach, taking them with a meal or snack is a reasonable comfort measure, though it is not a clinical requirement. When taking aciclovir, follow the instructions on your prescription label. If you miss a dose, follow the advice in the patient information leaflet or from your prescriber, and do not take a double dose. It also helps to drink plenty of water, especially if you have kidney problems. Before starting, tell your prescriber about other medicines, certain medicines, or herbal remedies, and ask if you are unsure how many aciclovir tablets to take.
Buying Aciclovir Online in the UK
To buy aciclovir tablets in the UK, you need a prescription, so they cannot be bought over the counter.
Through a regulated online pharmacy service, you may complete an online clinical assessment before aciclovir can be prescribed if appropriate, then the medicine is dispensed and delivered.
This provides an alternative route to assessment and treatment, but a genuine clinical assessment is still required before prescription.
Flying and Travelling With Aciclovir
Aciclovir is not a controlled drug under the Misuse of Drugs Act, so the formal Home Office process for travelling with controlled medicines, which involves personal licences and doctor's letters with specific wording, does not apply to it.
This is a meaningful distinction because a lot of general medicine-and-travel content online conflates the two.
For a non-controlled prescription medicine like aciclovir, the sensible general practice is simpler: keep tablets or cream in their original, pharmacy-labelled packaging, bring the patient information leaflet, and carry a prescription or consultation summary if you are travelling with a larger quantity or for an extended trip.
UK Airport Security and Liquids
Aciclovir tablets are not liquids, so they are not subject to any liquid restriction at airport security, though it is sensible to keep them easily accessible in case they need to be shown to security staff. Aciclovir cream does count as a liquid or gel for airport security purposes, and the rule that applies depends on your departure airport. As airport security rules can change, always check the latest guidance from your departure airport before travelling. Some airports may still apply traditional liquid restrictions, with containers packed into one clear resealable bag.
| Airport (2026 status) | Hand luggage liquid limit |
|---|---|
| Heathrow, Gatwick, Birmingham, Edinburgh, Bristol, Belfast City/International | Up to 2 litres, no separate bag required |
| Manchester, Stansted, Luton and most other UK airports | Still 100ml per container, in one clear resealable bag |
Aciclovir tablets are not subject to liquid restrictions. Aciclovir cream is treated as a liquid/gel for airport security purposes, and the permitted container size depends on the airport you are departing from. Security rules can change, so check your departure airport's current guidance before travelling.
Travelling Abroad, Including UK to Poland
For a short trip from the UK to Poland, travellers can generally carry a personal supply of aciclovir for their own treatment. Keep tablets or cream in the original pharmacy-labelled packaging and carry the patient information leaflet. For longer trips or larger quantities, carrying a copy of your prescription or a letter from your prescriber can be useful. Because entry requirements can change, check current Polish and UK government travel guidance before you travel.
Requirements can still vary by destination country, so if you have any doubt or want further guidance, the relevant embassy, official government travel advice, or a pharmacist are good sources to check before you travel.
Common Side Effects to Be Aware of Before You Travel
Most people tolerate aciclovir well, but side effects can include headache, dizziness, nausea, diarrhoea and tiredness.
These are worth bearing in mind before a flight, since dizziness or an upset stomach can be more noticeable when travelling.
Maintaining adequate fluid intake is particularly important if you have kidney problems, unless your clinician has advised you to restrict fluids.
Seek medical attention if you notice signs of a serious reaction, such as facial or throat swelling, severe rash, or passing very little urine. Speak to a doctor or pharmacist if side effects are severe or unusual, or if you take other medicines.
Cold Sore and Antiviral Treatment Options at EverydayMeds
Where a cold sore, rather than genital herpes or shingles, is the reason for treatment, EverydayMeds offers a range of options so you and your prescriber can choose what fits your situation, including topical cream and oral tablets in different strengths and brands.
Prices shown are the standard price for each treatment. Exact pricing, available strengths and any current offers are confirmed at checkout.
Medical Disclaimer
This article is for general information only and does not constitute medical or travel advice. It is not a substitute for a consultation with a qualified healthcare professional. Treatment suitability depends on an individual clinical assessment. Your prescriber will determine the appropriate treatment, dose and course length for your circumstances. Results vary between individuals. Travel requirements can vary by destination and by airport, so always check current guidance before you travel. If you experience symptoms that concern you, seek medical attention promptly or contact NHS 111.
