This combination of medications is commonly used for the treatment of migraine headaches. Here are the specific uses of each component:

Ergotamine Tartrate (1mg):

Use: An ergot alkaloid that constricts blood vessels in the brain, helping to reduce the throbbing effects of vascular headaches such as migraines.

Caffeine (Anhydrous) (100mg):

Use: A central nervous system stimulant that enhances the effectiveness of pain relievers and also helps to reduce drowsiness. In combination with ergotamine, it increases vasoconstriction, which can help alleviate migraine pain.

Paracetamol (250mg):

Use: An analgesic (pain reliever) and antipyretic (fever reducer). It is used to relieve mild to moderate pain and reduce fever.

Prochlorperazine Maleate (2.5mg):

Use: An antiemetic and antipsychotic. It helps to control nausea and vomiting associated with migraines and can also help with the pain and anxiety that often accompany severe headaches.

Uses of this Combination:

Migraine Relief: Effective in treating acute migraine attacks. Ergotamine tartrate helps to constrict dilated blood vessels in the brain, which can reduce the headache pain.

Pain Relief: Paracetamol provides pain relief for the headache and associated symptoms.
Nausea and Vomiting Control: Prochlorperazine maleate helps to control nausea and vomiting, common symptoms during a migraine attack.

Increased Effectiveness of Pain Relief: Caffeine enhances the pain-relieving effects of ergotamine and paracetamol.
Indications:

Acute Treatment of Migraine Attacks: This combination is used to treat acute migraine attacks, helping to reduce the severity and duration of the headache and associated symptoms.

Management of Migraine Symptoms: Helps manage the symptoms of migraines, including pain, nausea, vomiting, and sensitivity to light and sound.