New Simple Spectrophotometric Method for the Simultaneous Estimation of Paracetamol and Flupirtine Maleate in Pure and Pharmaceutical Dosage Form

Table 4

Precision results for PAR and FLU.

Parameters	Sampling time	PAR			FLU
		Amount present (mg)	Amount present (%)	RSD (%)	Amount present (mg)	Amount present (%)	RSD (%)
Repeatability; (𝑛=3)	0 hrs	326.61	100.49±0.46	0.46	100.61	100.61±0.98	0.97
	8th hrs	327.85	100.87±0.49	0.48	100.08	100.08±1.20	1.20
	16th hrs	326.90	100.58±0.25	0.25	98.76	98.76±0.36	0.36
Intermediate precision; (𝑛=6)	1st day	328.30	100.93±0.52	0.51	101.40	101.40±0.75	0.74
	2nd day	325.12	100.03±0.12	0.12	100.88	100.88±0.59	0.58
	3rd day	325.61	100.19±0.10	0.10	98.62	98.62±0.29	0.30
	Analyst-1	326.33	100.41±0.33	0.33	101.14	101.14±0.46	0.46
	Analyst-2	325.50	100.15±0.03	0.03	100.88	100.88±0.59	0.58
	Instrument-1	326.12	100.34±0.17	0.17	100.51	100.51±0.98	0.97
	Instrument-2	325.95	100.29±0.22	0.22	100.12	100.12±1.00	1.0037
Reproducibility; (𝑛=6)	Lab-1	325.51	100.15±0.12	0.12	99.23	99.23±0.38	0.36
	Lab-2	325.17	100.05±0.20	0.20	100.24	100.24±0.38	0.37

The low % RSD (<2%) for PAR and FLU indicated that the method is precise.