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Levitra and Claritin can be taken together with no expected reaction.
Ketoconazole CANNOT be taken with Levitra:
Side effects from Vardenafil (Levitra-TM) may get worse if you take Ketoconazole. Increased blood levels of Vardenafil may result in serious low blood pressure, which can lead to other serious side effects, like fainting or changes in heart rate. When taking Levitra-TM, contact your prescriber immediately if you experience chest pain, dizziness, fainting or falling spells, palpitations, shortness of breath, or a change in your usual heart beat (fast, slow, or irregular heart beat).
Let me know if you still have questions.
I would wait a week or two before trying it.