I entered all these drugs into the Drug.com's Drug Interactions Checker and the checker indicated that Aleve (naproxen) can have 'moderate' interactions with Voltaren (dicofenac). The warning suggests that you might want to cut back your use of Voltaren when using Aleve because Aleve makes Voltaren get absorbed more quickly (see below).
Always. though, check with your pharmacist or doctor before combining medications; The Drug Interactions Checker, as helpful as it is, may not be complete.
naproxen ↔ diclofenac
Applies to: Aleve (naproxen), Voltaren Gel (diclofenac topical)
Talk to your doctor before using diclofenac topical together with naproxen. Both of these medications are considered nonsteroidal anti-inflammatory drugs. Since the medication in diclofenac topical may be absorbed from the skin, combining it with naproxen may increase the risk and/or severity of side effects reported with this class of drugs, including stomach ulcer, fluid retention, high blood pressure, bleeding, and liver or kidney problems. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.