Final answer:
The recommended treatment for tachycardia without a wide QRS complex typically includes beta blockers or antiarrhythmic agents.
Step-by-step explanation:
The recommended drug for tachycardia without a wide QRS according to the "adult tachycardia with a pulse" algorithm is typically a beta blocker or an antiarrhythmic agent.
For tachycardia with a narrow QRS complex (which infers a supraventricular origin), treatments may include medications such as adenosine, beta blockers like metoprolol, or calcium channel blockers such as diltiazem.
Important to note, the administration of these medications should be guided by healthcare professionals based on individual patient details and underlying causes of tachycardia.
More invasive procedures such as the insertion of a pacemaker or surgery might be considered if medication therapy is ineffective or in more severe cases.