This is the 11660th most frequent Portuguese word.
persistirem
"Persistirem" means "to persist" or "to endure" (in the third-person plural subjunctive or future form).
The word "persistirem" is used to express the continuation of problems in the future, making this a subjunctive tense.
Se os problemas persistirem, entre em contato com o suporte técnico.
If the problems persist, contact technical support.
In this sentence, "persistirem" is used to indicate a hypothetical condition related to the continuation of side effects.
Os sintomas podem piorar caso os efeitos colaterais persistirem.
The symptoms may worsen if the side effects persist.
Here, "persistirem" denotes the continuation or recurrence of doubts, emphasizing an action that might continue to happen.