What does the Spikevax LP.8.1 product information warn about myocarditis and pericarditis after vaccination?

Spikevax LP.8.1 information warns of increased myocarditis and pericarditis risk, primarily within 14 days, especially in younger males and after the second dose; most recover, but some require intensive care and fatal cases occur, while chest pain, breathlessness or palpitations require immediate medical attention.