Performance enhancing drugs such as Clenbuterol should be used sensibly and collecting as much qualified information as possible is the key to optimizing and reaping complete benefits of Clenbuterol, which is also known as Clen.

Clenbuterol is not to be used by those having a sensitivity to the medication or any of its substances or those experiencing hyperthyroidism, tachycardia, tachyarrhythmia, heart or thyroid diseases, high blood pressure, coronary artery disease, congestive heart failure, prostatic hypertrophy, hyperthyroidism, urinary retention, glaucoma, ischemic heart disease, myocardial infarction (acute period), and hypertrophic obstructive cardiomyopathy. Long-term use of this medication can decrease stamina stages to a considerable level. The medication is also not suggested for expecting and breast feeding females and kids. People with diabetic issues should seek healthcare guidance before starting use of this steroid.

Moreover, Clenbuterol should not be taken by those who are using cardiac glycosides, beta-blockers, sugar lowering drugs, insulin, CNS stimulants, MAO inhibitors, and sympathomimetic agents. It should not be taken by those already administered with or using terbutaline, oxytocin, propanolol and other beta-blockers, digoxin, dinoprost (Lutalyse, Prostamate), monoamine oxidase inhibitors, or inhaled anesthetics.  Under no situation, Clenbuterol should be used or taken through recycled or distributed needles as such a practice increases the chances of injection site pain and sexually-transmitted diseases such as HIV and AIDS. Most of these adverse reactions are extremely rare and most subside by themselves in over seven to ten days.