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NEET UG 2026 » NEET UG Study Material » Chemistry » tranquilisers
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tranquilisers

Tranquilliser is a class of medications used to treat anxiety and sleep disturbances, among other conditions.

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A tranquilliser’s calming effect is used to alleviate the physical and psychological symptoms of worry, tension, impatience, or fear. They also aid in the induction of a sense of well-being by decreasing the sensation of being on edge. For short- and medium-term usage, the medications are advised to be taken. A significant portion of sleeping tablets is made up of these medications. Neurotransmitters such as noradrenaline, for example, are critical in regulating mood swings.

Tranquilliser

Not only may tranquillisers address anxiety and sleep problems, but they can also help stabilise mental health illnesses such as bipolar disorder by reducing their symptoms. If you are experiencing a short-term crisis, your doctor may give you a sedative to help you deal. If a person is considering suicide and is not feeling calm and capable of making sound judgments, medicines may help them feel more in control and capable of making good decisions.

Generally speaking, the word “tranquilliser” refers to a broad class of medications that depress the central nervous system and have a calming effect. Though most tranquillisers are prescription medications, several can be bought over-the-counter (OTC).

Tranquillisers are classified into categories:

  • Minor Tranquillisers 
  • Major Tranquillisers 

Minor Tranquillisers

Minor Tranquillisers, also known as anxiolytics, are medications used to induce drowsiness and alleviate anxiety symptoms. Anti-anxiety meds are the term used nowadays to describe these therapies.

  • Phenothiazines
  • Piperazine compounds
  • Piperidine compounds
  • Thioxanthenes

Major Tranquilisers

Major tranquilisers, also known as neuroleptics, are medications designed to treat mental illnesses such as schizophrenia. These medications are used to treat hallucinations and other types of delusional thinking. Principal tranquillisers include phenothiazines, thioxanthenes, butyrophenones, clozapine, and alkaloids from the plant rauwolfia. Phenothiazines are commonly given for extended periods, whereas thioxanthenes and butyrophenones are used for short periods.

  • Pentobarbital
  • Lorazepam
  • Zolpidem
  • Butalbital

Examples of Tranquillisers

In the same way that the other medications do, tranquillisers can cause harmful effects, even when used in the approved amounts. Low doses of moderate tranquillisers may result in sleepiness and lack of coordination, similar to drinking when consumed in large quantities. When a patient initially begins taking medicine, these responses are more likely to occur, although they can emerge later if a buildup of the medication happens over time. Extended usage of tranquillisers may cause a severe drop in mood. In addition to psychotic disorders, anxiety disorders, sleep disorders, and seizures, they are also used to treat high blood pressure and blood pressure, sometimes in patients.

  • Serotonin, a neurotransmitter important in anxiety, is controlled by antidepressants. Treatment of anxiety with antidepressants may seem contradictory at first. Still, this class of drugs affects neurotransmitters regulating mood and anxiety.
  • Anxiety and sleep disorders used to be treated with barbiturates. Due to the significant danger of abuse and dependency and the limited therapeutic index, the dose necessary for the desired effect, and the dose that might cause coma or death, they are rarely used nowadays for this reason. While benzodiazepines have mainly supplanted barbiturates as an anticonvulsant (to treat seizures) or general anaesthesia, barbiturates are still used.
  • Benzodiazepines are administered for anxiety, sleeplessness, seizure, muscular spasms, and agitation. They are also used to treat alcohol withdrawal and panic attacks. Fifteen benzodiazepines have received FDA approval for usage in the United States, including Ativan, Valium, Klonopin, Xanax, and Klonopin (clonazepam) (alprazolam).
  • Drugs that target the sympathetic nervous system to reduce blood pressure are called Sympatholytics (essentially the “fight-or-flight” response). Anxiety disorders, such as post-traumatic stress disorder, respond well to this medication class (PTSD).

Uses of Tranquillisers

  • They provide a person with a sense of well-being, relieving them of stress, tension, anxiety, or impatience, among other symptoms. The active ingredients in sleeping tablets are phenylephrine and methylphenidate.
  • There are many different tranquillisers, and each one has a unique mechanism of action that must be understood.
  • Taking noradrenaline as an example, it is a tranquilliser that helps to improve one’s mood. If the level of noradrenaline in the blood is low, the signal-sending activity in the brain is similarly soft, which results in a depressed state of mind. Antidepressant medications or a tranquilliser can be used in these circumstances.
  • These medications work by interfering with the function of enzymes that are involved in the breakdown of noradrenaline and other stimulants. Due to the delayed metabolism of noradrenaline caused by the inhibition of enzymes, noradrenaline remains active at its receptors for a more extended period, and the effects of depression are reduced.

What Is the Mechanism of Action of Tranquillisers?

The mechanism of action of tranquillisers determines how they affect the body. For the three major pharmacological classes with a tranquilising effect—barbiturates, benzodiazepines, and sleep medications—the mechanisms of action are nearly identical for each of the three primary drug groups.

Methods of Consumption

Various routes of administration administer different forms of tranquilisers for humans. Tablets, capsules, injections, and suppositories are the most used product formats. It can be taken orally, injections are given into muscles (typically in the buttocks or upper arm), and suppositories are placed in the anal canal.

In What Ways Do Tranquillisers Work?

Depressants for the central nervous system function by depressing the central nervous system. While the specifics of the mechanism of action might vary (for example, by targeting various GABA receptors), mild tranquilisers for humans increase the inhibitory neurotransmitter GABA system, boosting the effects of the neurotransmitter itself. Compared to barbiturates, benzodiazepines, and sleep medications, major and minor tranquillisation substances outside these pharmacological groups have distinct effects. But their final result is a depressive state of the central nervous system (CNS).

Effects of Tranquillisers

When misused, benzodiazepines can cause severe withdrawal symptoms that can be fatal if not treated immediately. Seizures, panic episodes, sleeplessness, and muscular soreness are all possible side effects of benzo detoxification. Withdrawal effects with short-acting benzodiazepines, such as Xanax, are the most severe and prolonged.

Apart from respiratory depression, opioids have many undesirable side effects: constipation, which can cause the intestines to slow down or cease functioning normally.

The Side Effects of Tranquillisers are:

  • Itching due to a rash.
  • Dysfunction in the bedroom.
  • Nausea
  • Deficiency in food cravings.
  • Seizures associated with withdrawal.
  • Weakened cognition.
  • Memory lapses in the short term.
  • A heart rate that is out of control.

Conclusion:

Sleepiness and slower breathing are symptoms of a tranquilliser, which depresses the central nervous system and causes relaxation, anxiety reduction, and drowsiness. Tranquillisers are given to treat back pain to alleviate the anxiety and sleeplessness that might occur due to acute pain bouts. 

A popular tranquilliser, Valium (diazepam), is administered to ease low back pain linked with muscular spasms on a short-term basis to alleviate the discomfort. Although using tranquillisers in pain treatment is recommended, it should be done with caution because most tranquillisers are potentially addictive and have additional significant adverse effects like depression, hallucinations, and forgetfulness, among others. Preparation for medical procedures such as injections or MRI scans might be more accessible by administering tranquilliser medicines to the patient beforehand.

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