Paracetamol is a relatively a safer drug. It is a drug of choice when a firm diagnosis for headache has not been made.
Clotam is the brand name of a medicine called tolfenamic acid. It is a Non-Steroidal Anti-inflammatory Drug (NSAID) which is approved for use in migraine only.
All NSAIDs including tolfenamic acid cause gastro-intestinal side effects and hence should only be taken on full stomach. Other side effects are: skin reactions, dysuria, rarely tremor, fatigue, breathlessness, asthma-like symptoms, blood disorders and temporary liver dysfunction.
Tolfenamic acid is a much more potent pain-killer; hence it is approved for migraine.