The J&J vaccine: What are its side effects? on: April 27, 2021, 08:36:58 pm #1 The Johnson & Johnson COVID-19 vaccine is back, and the word is that that the cases of blood clots possibly related to the vaccine were so rare that the vaccine is considered safe. From Medical News Today (April 27, 2021), "Johnson & Johnson COVID-19 Vaccine: What Are the Side Effects?": Johnson & Johnson (Janssen) COVID-19 vaccine: Side effects In this Spotlight feature, we offer an overview of the possible side effects of the Johnson & Johnson COVID-19 vaccine and discuss whether the vaccine is safe. bit.ly Logged MS Speaks--online for 20 yearsSPMS, diagnosed 1980. Avonex 2001-2004. Copaxone 2007-2010. Glatopa (glatiramer acetate 40mg 3 times/week) 12/16/20 - 3/16/24.