Ritalin tablets, generic name methylphenidate hydrochloride tablets, have the efficacy and effect of excitation of the respiratory center, the specific use of the doctor’s advice. Methylphenidate Hydrochloride Tablets is a respiratory stimulant, suitable for attention deficit hyperactivity disorder (mild brain dysfunction, hyperactivity syndrome in children), episodic sleeping sickness, and coma caused by overdose of central depressants such as chloral hydrate and barbiturates. Contraindications to the use of the drug include those who are allergic to the product, glaucoma, agitated depression, and over-excitement, and people who should be cautious of the use of the drug include patients with epilepsy, hypertension, and athletes. Adverse reactions such as insomnia, vertigo, dizziness, headache, nausea, anorexia, and palpitations may be caused by the drug. The drug is dependent, and specific use should be under the guidance of a specialist, not unauthorized use.