Should i continue taking antibiotics and antihistamine if i have irregular heartbeat?i have gastritis too and taking levofloxacin for throat..?

Depends on the med: Some antihistamines, especially when combined with decongestants, can aggravate an irregular heartbeat. Some antibiotics should also be avoided if you have an irregular heartbeat. Some medications can also interract with other medications you may be taking and cause problems. Levofloxin and most over the counter antihistamines without decongestants should be safe, but depends on other meds.