There are two types of antipsychotics: typical and atypical.
Typical antipsychotics were developed in the 1950s. Although they're still used to treat schizophrenia today, they're less widely used due to their side effects. This is because they mainly appear to treat only the positive symptoms and their side effects can be severe. These side effects include dry mouth, blurred vision, dizziness, muscle spasms or cramps and tremors.
Whilst typical antipsychotics act upon dopamine receptors, atypical antipsychotics act on both serotonin and dopamine receptors.
Nowadays, most people are often prescribed atypical antipsychotics instead. They were developed in the 1950s and introduced in the 1970s as a result of the adverse side effects of typical antipsychotics. Atypical can treat both positive and negative symptoms but they can have severe side effects too