Our expert says:
JakaN, indeed --- good to hear from you again. Ouch, though, sorry to ehar about the abscess, which obviously needs a dentist's assistance ASAP, and may need an antibiotic which could help the pain. As I understand it a number of anti-inflammatories such as Nurofen / ibuprofen and others, and aspirin, can raise the plasma levels of Lithium, and potentially even could cause some lithium toxicity. Paracetamol is probably a better alternative until you reach the dentist.
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