Can aciclovir cause dizziness?
Yes. Dizziness is a known possible side effect of aciclovir. It can occur in some people taking aciclovir by mouth or as an injection, and it should be considered a potential reaction rather than something unrelated.
What might make dizziness more likely with aciclovir?
Dizziness may be more likely if aciclovir affects kidney function, since the drug is cleared by the kidneys. Dehydration or high doses can increase the risk of side effects and related complications. If you notice dizziness along with very little urine, swelling, or confusion, contact a clinician promptly.
What other symptoms should you watch for?
If dizziness comes with severe weakness, fainting, trouble speaking, confusion, severe headache, or rash/swelling of the face or throat, get urgent medical help. These can signal a serious reaction or a different problem than mild medication side effects.
What should you do if you feel dizzy after starting aciclovir?
Check whether the dizziness started soon after the dose and whether you can safely sit or lie down. Don’t drive or operate machinery until you know how the medication affects you. Call your prescriber or pharmacist for guidance—especially if the dizziness is moderate to severe, persists, or worsens.
When to seek urgent care
Seek urgent care if dizziness is severe, you faint, you have signs of an allergic reaction (hives, facial swelling, breathing trouble), or you have symptoms of kidney problems (markedly reduced urination, extreme fatigue, confusion).
Are there alternatives if dizziness continues?
If dizziness persists or is bothersome, your prescriber can reassess the treatment plan. Options may include adjusting the dose, switching the formulation, or choosing a different antiviral depending on what infection is being treated and your kidney function.
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