Since<unk>  blockers are known to relax the cardiac muscle and to constrict the smooth muscle,<unk> -adrenergic antagonists, including<unk> , have an additive effect with other drugs which decrease blood<unk> essure, or which decrease cardiac contractility or conductivity. Clinically significant interactions particularly occur with: * Verapamil * Epinephrine (adrenaline) * β2-adrenergic receptor agonists * Salbutamol, levosalbutamol, formoterol, salmeterol, clenbuterol etc. * Clonidine * Ergot alkaloids * Isoprenaline (isoproterenol) * Nonsteroidal anti-inflammatory drugs (NSAIDs) * Quinidine * Cimetidine * Lidocaine * Phenobarbital * Rifampicin * Fluvoxamine (slows down the metabolism of<unk>  significantly, leading to increased blood levels of<unk>
Propranolol
Bupranolol
Brotizolam
Acebutolol
Atenolol
Clonidine
Drospirenone
Stanozolol