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Aciclovir can sometimes cause side effects such as abdominal pain, diarrhoea, dizziness, fatigue, fever, headaches, nausea, skin sensitivity to the sun, skin reactions, and vomiting.
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Mostly, these are mild and will get better by themselves, but if you’re worried, you can talk to us.
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if you DO get a cold sore, do your best not to touch open cold sores as this can cause them to spread to other parts of your body.
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Other steps you can take during treatment is to avoid oral sex and kissing, until the cold sores have healed.