They are impossible to see. Usually, the addict feels the first effects of the drug 30 to 90 minutes after taking it. Among the physical effects include: dilated pupils, elevated body temperature, increased pulse rate and blood pressure, heart, sweating, loss of appetite, insomnia, dry mouth and tremors.

Sensations and feelings change too. The person consuming the drug may feel several different emotions at once or swing rapidly from one emotion to another. Reverse the direction of time and consciousness itself in the individual. All these changes may cause fear or panic. Who consume can also experience: confusion, suspicion, anxiety and sense of inadequacy and loss of control.

Hallucinogens are drugs that affect perceptions, sensations, mental capacity, awareness and emotions of people. In this category are drugs such as LSD (lysergic acid dieltamídico), mescaline, psilocybin and DMT. Some hallucinogens come from natural sources, others such as LSD are synthetic or manufactured drugs.

LSD is manufactured from lysergic acid is a substance derived from ergot fungus. It was discovered in 1938 and is one of the most powerful chemicals that change the mood. Is usually taken by mouth, but sometimes, it is injected.

Mescaline comes from the peyote cactus and although not as potent as LSD, its effects are identical. Mescaline is usually smoked or swallowed in capsules or tablets.

With regard to psilocybin, derived from certain fungi, is sold as tablets or capsules. The DMT is another psychedelic drugs (hallucinogenic) that acts like LSD. Its effects begin almost immediately and last a fairly long term.